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Yes, today's build has the August 5th security patches but not the fix for the keymap bug. Trying to flash an older release triggers the rollback protection in the closed source components, and will force a factory reset to recover :-( Unfortunately we haven't found a fix for the problems with the touchscreen on other devices. This leaves us with a difficult choice, between the security patches and proper keymap support when the accessibility hook is enabled. I don't have any easy answer (other than building your own OS image), but the full details of the August security patches are here:

Thanks for the reply. I personally merely use Lineage for tests currently (so no big deal with resets). I'm just reporting so others can decide if they should upgrade or stay on the 20210726 for now. 🙂 If someone need an app that uses the accessibility keyboard hook and interferes, but does not use it frequently one can consider as another option to leave the accessibility off for the app, and only turn it on when needed temporarily. People should also note that it is not all apps using the accesibility hooks that interfere. (e.g. There are no issues with Greenify)

It is partly a hardware issue that should be flawlessly corrected with proper software, as I've described. My repeated key issues started about 9 months ago. Same thing with my Photon Q. I'm surprised the backspace key didn't break off and fall right out of the phone. That's very interesting that it's happening on LineageOS as well. But I'd have to guess that the way keyboard input is processed on LineageOS was just "borrowed" from Android. I'm an old-school microcontroller coder, and I have an example of this happening in early 80's tech. I have an old Radio Shack programmable

I did OTA for the first time rather than ADB and it works great. And, yes, root is preserved.

Success here with OTA update, too, which kept Magisk and MindThe Gapps as they were.