Ok researching this a bit. It seems like its a Flutter engine problem. Can you try this or check this?
“…the problem is sometimes solved by disabling the virtual keyboard in the Linux Mint accessibility settings…”
Two sources so far (and still researching): https://github.com/flutter/flutter/issues/153560 https://github.com/flutter/flutter/issues/153560#issuecomment-2503660633
When you run the app from terminal, is there any logging output? Which NVIDIA drivers are you using?