CentOS - Jun 2020 - Switching between keyboards in CentOS 7 using the MATE desktop

I switch between three keyboards, two western ones and Chinese Pinyin entry. I
have fcitx installed to switch between Pinyin and standard entry and use the
keyboard switching in MATE to switch between keyboards.

While I originally believed there was a bug in fcitx since switching between
entry fields in firefox, chromium and thunderbird using the non-default keyboard
always switched me back to the default keyboard, this even when hitting ENTER in
a Chromium entryfield, I now believe the problem might lie in MATE or CentOS.
There is no problem remembering whether a particular program is configured by me
to use Pinyin input or not so that seems to work fine.

Can anyone else confirm this issue? Might it be a configuration issue on my end?
By the way, I use CTRL-SHIFT+RIGHT-SHIFT to switch between keyboards.