dovecot - Oct 2020 - Core dump with search in a virtual folder with FTS enabled

Hi all,
when I try to search in a virtual mailbox with FTS enabled,?imap cores dump.
Sample IMAP session in a virtual mailbox:
  1 OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT
SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND
URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED
I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH
LIST-STATUS BINARY MOVE SNIPPET=FUZZY PREVIEW=FUZZY STATUS=SIZE SAVEDATE
LITERAL+ NOTIFY] Logged in2 SELECT Search/All* FLAGS (\Answered \Flagged
\Deleted \Seen \Draft)* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen
\Draft \*)] Flags permitted.* 1 EXISTS* 0 RECENT* OK [UNSEEN 1] First unseen.*
OK [UIDVALIDITY 1602234810] UIDs valid* OK [UIDNEXT 2] Predicted next UID2 OK
[READ-WRITE] Select completed (0.002 + 0.000 + 0.001 secs).2 UID SEARCH HEADER
From userConnection closed by foreign host.
When I search in INBOX all OK:

1 OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT
SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND
URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED
I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH
LIST-STATUS BINARY MOVE SNIPPET=FUZZY PREVIEW=FUZZY STATUS=SIZE SAVEDATE
LITERAL+ NOTIFY] Logged in
2 SELECT INBOX* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)* OK
[PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.*
1 EXISTS* 0 RECENT* OK [UNSEEN 1] First unseen.* OK [UIDVALIDITY 1602234520]
UIDs valid* OK [UIDNEXT 2] Predicted next UID* OK [NOMODSEQ] No permanent
modsequences2 OK [READ-WRITE] Select completed (0.003 + 0.000 + 0.002 secs).2
UID SEARCH HEADER From user* SEARCH 12 OK Search completed (0.002 + 0.000 +
0.001 secs).
Error log:
Oct 09 12:58:22 Panic: imap(user)<31554><Y3pl0zqx3s9/AAAB>: Module
context fts_mailbox_list_module missingOct 09 12:58:22 Error:
imap(user)<31554><Y3pl0zqx3s9/AAAB>: Raw backtrace:
/usr/lib64/dovecot/libdovecot.so.0(backtrace_append+0x42) [0x7fbe88afddf2] ->
/usr/lib64/dovecot/libdovecot.so.0(backtrace_get+0x1e) [0x7fbe88afdefe] ->
/usr/lib64/dovecot/libdovecot.so.0(+0xec42e) [0x7fbe88b0842e] ->
/usr/lib64/dovecot/libdovecot.so.0(+0xec4d1) [0x7fbe88b084d1] ->
/usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7fbe88a5f4ea] ->
/usr/lib64/dovecot/lib20_fts_plugin.so(+0x123f7) [0x7fbe8821f3f7] ->
/usr/lib64/dovecot/lib20_fts_plugin.so(+0xe2f4) [0x7fbe8821b2f4] ->
/usr/lib64/dovecot/lib20_fts_plugin.so(fts_search_lookup+0xd4) [0x7fbe8821b7b4]
-> /usr/lib64/dovecot/lib20_fts_plugin.so(+0x11a98) [0x7fbe8821ea98] ->
dovecot/imap(imap_search_start+0x70) [0x55e251f4e620] ->
dovecot/imap(cmd_search+0xd6) [0x55e251f3ea86] ->
dovecot/imap(command_exec+0x64) [0x55e251f46cc4] -> dovecot/imap(+0x1ce4f)
[0x55e251f44e4f] -> dovecot/imap(+0x1ced7) [0x55e251f44ed7] ->
dovecot/imap(client_handle_input+0x205) [0x55e251f45365] ->
dovecot/imap(client_input+0x75) [0x55e251f45925] ->
/usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x65) [0x7fbe88b20b45] ->
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x12b)
[0x7fbe88b2249b] ->
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x59) [0x7fbe88b20c49]
-> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7fbe88b20e88]
-> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7fbe88a90393] -> dovecot/imap(main+0x332) [0x55e251f36f12] ->
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7fbe88670555] ->
dovecot/imap(+0xf115) [0x55e251f37115]Oct 09 12:58:22 Fatal:
imap(user)<31554><Y3pl0zqx3s9/AAAB>: master: service(imap): child
31554 killed with signal 6 (core dumped)
Dovecot configuration (doveconf -n):# 2.3.11.3 (502c39af9):
/etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-1127.19.1.el7.x86_64 x86_64 CentOS Linux release 7.8.2003
(Core)first_valid_uid = 1000
mail_debug = yesmail_location = maildir:~/Maildir:INDEX=MEMORYmail_plugins =
virtual fts fts_lucenembox_write_locks = fcntlnamespace inbox {? inbox = yes?
location =? prefix =? separator = /}namespace virtual {? hidden = yes? list =
no? location = virtual:/etc/dovecot/virtual:INDEX=~/virtual? prefix = Search/?
separator = /? subscriptions = no? type = private}passdb {? args = scheme=PLAIN
username_format=%u /etc/dovecot/users? driver = passwd-file}plugin {? fts =
lucene? fts_lucene = whitespace_chars=@.}userdb {
? args = username_format=%u /etc/dovecot/users? driver = passwd-file}
Backtrace:#0? 0x00007fbe88684387 in __GI_raise (sig=sig at entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:55
#1? 0x00007fbe88685a78 in __GI_abort () at abort.c:90#2? 0x00007fbe88b083e7 in
default_fatal_finish (status=0, type=<optimized out>) at failures.c:459#3?
fatal_handler_real (ctx=<optimized out>, format=<optimized out>,
args=<optimized out>) at failures.c:471#4? 0x00007fbe88b084d1 in
i_internal_fatal_handler (ctx=<optimized out>, format=<optimized
out>, args=<optimized out>) at failures.c:848#5? 0x00007fbe88a5f4ea in
i_panic (format=format at entry=0x7fbe88225058 "Module context
fts_mailbox_list_module missing") at failures.c:523#6? 0x00007fbe8821f3f7
in fts_mailbox_backend (box=<optimized out>) at fts-storage.c:957#7?
0x00007fbe8821b2f4 in fts_search_lookup_level_multi (and_args=<optimized
out>, args=0x55e253347698, fctx=0x55e2533be330) at fts-search.c:182#8?
fts_search_lookup_level (fctx=fctx at entry=0x55e2533be330, args=0x55e253347698,
and_args=and_args at entry=true) at fts-search.c:210#9? 0x00007fbe8821b7b4 in
fts_search_lookup (fctx=fctx at entry=0x55e2533be330) at fts-search.c:360#10
0x00007fbe8821ea98 in fts_mailbox_search_init (t=0x55e253342e60,
args=0x55e2533475c8, sort_program=<optimized out>, wanted_fields=0,
wanted_headers=0x0) at fts-storage.c:260#11 0x000055e251f4e620 in
imap_search_start (ctx=ctx at entry=0x55e2533353f0, sargs=0x55e2533475c8,
sort_program=sort_program at entry=0x0) at imap-search.c:540#12
0x000055e251f3ea86 in cmd_search (cmd=0x55e253335238) at cmd-search.c:48#13
0x000055e251f46cc4 in command_exec (cmd=cmd at entry=0x55e253335238) at
imap-commands.c:201#14 0x000055e251f44e4f in client_command_input (cmd=cmd at
entry=0x55e253335238) at imap-client.c:1178#15 0x000055e251f44ed7 in
client_command_input (cmd=0x55e253335238) at imap-client.c:1243#16
0x000055e251f45365 in client_handle_next_command (remove_io_r=<synthetic
pointer>, client=0x55e2533349c8) at imap-client.c:1285#17 client_handle_input
(client=client at entry=0x55e2533349c8) at imap-client.c:1299#18
0x000055e251f45925 in client_input (client=0x55e2533349c8) at
imap-client.c:1343#19 0x00007fbe88b20b45 in io_loop_call_io (io=0x55e25332dfe0)
at ioloop.c:713#20 0x00007fbe88b2249b in io_loop_handler_run_internal
(ioloop=ioloop at entry=0x55e253311de0) at ioloop-epoll.c:222#21
0x00007fbe88b20c49 in io_loop_handler_run (ioloop=ioloop at
entry=0x55e253311de0) at ioloop.c:765#22 0x00007fbe88b20e88 in io_loop_run
(ioloop=0x55e253311de0) at ioloop.c:738#23 0x00007fbe88a90393 in
master_service_run (service=0x55e253311c40, callback=callback at
entry=0x55e251f53340 <client_connected>) at master-service.c:851#24
0x000055e251f36f12 in main (argc=1, argv=0x55e253311960) at main.c:534
I tried with both solr and lucene engines, always core dump.
Packages installed:   
   - dovecot-2.3.11.3-4.x86_64
   - dovecot-debuginfo-2.3.11.3-4.x86_64
Maybe I missed a configuration parameter?

Thank you.
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