Even if I remove default Geany shortcut cmd+space (complete word), still MacOS system shortcut does not work. I use it for language switch (since MacOS Lion).

There is also second, may be connected problem — sometimes other shortcuts do not work completely, as if Geany thinks it is in wrong locale, although typing text shows it is in EN locale. Switching to another app (cmd+tab), pressing TWICE cmd+space to switch locale and returning to Geany fixes this issue. Also none of shortcuts work on non latin locale.

OS: MacOS Ventura 13.5, same on Monterey 12.6.7
Arch: M1 (arm), same on x86 macbook
Geany 1.38 installed from homebrew