I can’t edit my post, but as a final update, the bug reappeared within hours after my post, but I immediately gave up. It’s just too much hassle.
IMO, I’d do not recommend the GDO Blaq for HomeKit users today, generally speaking. While the forum here is handy for suggestions, GDO Blaq has no official HomeKit support and there is no guarantee native support is coming. Thus, it’s all hacked together with Home Assistant → HomeKit Bridge or Homebridge → a third-party plugin.
Troubleshooting bugs with multiple third-party layers is a PITA, as one might expect.