samba - Dec 2020 - Samba 4.12 -> 4.13: can't delete files (only files, not folders)

Hello,

Arch users have's a regression after upgrade samba from 4.12.6 to 4.13.2 [1]

Me too, my samba instance is a slice for migration from Windows 2012 to 
2019,

used only for SMB3.1.1 -> SMB2 access, smb.conf:


```

[global]
 ?? workgroup = CENTER
 ?? client min protocol = SMB2
 ?? server min protocol = SMB2
 ?? server string = files
 ?? security = user
 ?? map to guest = Bad User
 ?? hosts allow = 100.100.105.0/24
 ?? unix charset = UTF8
 ?? load printers = no
 ?? printcap name = /dev/null
 ?? dns proxy = no
 ?? unix extensions = no
 ?? disable spoolss = yes
 ?? logging = syslog
 ?? log level = 2
 ?? max log size = 0

[radosfs]
 ?? path = /mnt/buhs
 ?? browseable = yes
 ?? public = yes
 ?? writable = yes
 ?? guest ok = yes
 ?? force user = root
 ?? force group = root
 ?? create mask = 0777
 ?? force create mode = 0777
 ?? force directory mode = 0777
```

Mount point is:

```

//100.100.105.100/exchange on /mnt/buhs type cifs 
(rw,relatime,vers=3.1.1,cache=strict,username=?????????????,uid=0,forceuid,gid=0,forcegid,addr=100.100.105.100,file_mode=0644,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1,_netdev)

```


Regression is: on Samba 4.13 share users can't delete files. Users can 
create files, folders, move files, delete folders. Revert Samba to 
4.12.6 resolvs this problem



Thanks,

k


[1] https://bbs.archlinux.org/viewtopic.php?id=259893