This is a report from the GC-BTT GitHub. I was able to confirm the bug, and it seems to be a BTT-related issue. When using command-tab, the Touch Bar cannot be interacted with, meaning the escape key cannot be pressed.
User report: https://github.com/GoldenChaos/GoldenChaos-BTT/issues/2
Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.): Touch Bar
Device information:
- Type of Mac: MacBook Pro w/ Touch Bar
- macOS version: Catalina Developer Beta (Latest)
- BetterTouchTool version: 3.201