Comment 9 for bug 1890905

I could reproduce this issue in Ubuntu impish by simply adding:

export XDG_CACHE_HOME=/tmp/mycache

to ~/.profile and relogin.

Then, as James Henstridge suggested, I tried starting it like this:

IBUS_USE_PORTAL=1 chromium

Unfortunately that did not help.

I made one observation, though, which might be useful as a workaround: If I set the XDG_CACHE_HOME variable to "/tmp" (instead of "/tmp/mycache"), typing within the Chromium snap, including inputting with an IBus engine, worked as expected. Possibly the explanation is that /tmp is used as a fallback, sort of, to deal with BSD systems.

https://github.com/ibus/ibus/blob/master/bus/server.c