Thank you so much Quinn for looking into this! I now changed the CFBundleExecutable to just Plover. The resulting DMG file can be downloaded from the Artifacts section here if you have a GitHub account. Sadly, the behavior didn't change and the menu bar icon is still missing.

Thank you Quinn! You'd need to be logged in into GitHub to see the download button. I sent you the DMG via email in case you don't have a GitHub account.

That was fantastic advice, thank you so much Quinn! I was able to create a minimal test project that reproduces the issue. You were right, the trampoline C file is the problem. And regarding your question: yes, it's only a single process that is launched by this trampoline C file. I opened a corresponding bug ticket: FB21015611