Zyn-Fusion crashes when typing name in save instrument dialog

[ChrisDAT20]

When I open "save instrument" dialog and navigate to the folder where the instrument should be stored into, typing a name like "Kick" very often leads to a crash. Sometimes I can type more characters, but usually the crash happens after 2-3 characters, e.g. the "i" in "Kick". Navigating in the filename field with the cursor keys (left and right arrow) too crashes Zyn-Fusion.

Zyn-Fusion 3.0.6 runs inside Ardour 8.2 (Debian Trixie, amd64), and I enabled that Zyn-Fusion can receive all keys which are pressed.