bug(linux): weird space bug in LibreOffice on Linux

From https://community.software.sil.org/t/weird-space-bug-on-linux/9864:

> Hello, I am experiencing a bug wherein if I press backspace after inserting space, it’s not deleted, but instead the last character before the space is, and the space remains after the char. It is also dependent on the number of times I press space: if I insert many spaces and press bksp, the last character before the string of spaces disappears, but not the string. And the cursor is moved to before the string. I have recorded this behavior.

> 

> It happens with every Keyman keyboard that I use. If someone knows how to fix this so that they start behaving normally, i.e. the backspace deletes only 1 previous character, I would be grateful.
OS: Linux Mint 21.3 Cinnamon
Keyman version: 17.0(.335-1~sil1~jammy(?))
Also when I want to launch Keyman only Keyman Configuration shows up in the app menu, in case this info is somehow relevant.