Since I can not reproduce it I can only go through the code to spot the mistake. The following change might help: Comparing master...fix/own-dev-paused · Martchus/syncthingtray · GitHub
I’ve created Windows binaries containing that change if you’d like to test them: https://martchus.no-ip.biz/repo/arch/ownstuff-experimental/os/x86_64/mingw-w64-syncthingtray-qt6-1.1.3-1-any.pkg.tar.zst