Hey @metaloss, thanks for the report! This one’s already sorted in a newer release, your build (3.18.9) is from before the change.
Grab the latest from cursor.com/download (3.19.13) since a .deb/apt install won’t auto-update, restart, and the GitHub trigger submenu should behave.
In the meantime, type the trigger name into the Search Triggers… box and click the result, or use the arrow keys + Enter instead of hovering. Let me know if it still acts up after updating!