This happened to me too. I'm on the PTC and I think I was on v83. The device prompted me to add an unlock pattern and presented me with 9 dots arranged in a square grid to set the pattern. However, to unlock the device presents the 8 dots arranged in a hexagon. This is clearly a bug.
There are a couple of threads on Reddit with a few users experiencing the same thing and are locked out of their devices until some kind of fix is made available. Customer support told me to factory reset the device.
Some users with dev mode enabled were able to unlock the device using ADB and entering the unlock pattern as numbers. I do have dev mode enabled, but I have to authorize the device from within the headset first (which can't be done while it is locked).
There has to be some kind of better answer. Perhaps Meta could provide update that can be manually sideloaded that can present the 9 dot grid so the unlock pattern can actually be entered?
It's very annoying for sure, but even to fix the pattern, you'll probably have to factory reset anyway. If I were you I'd just back up everything, games and apps, through the headset then just go ahead and reset. I had to do it due to a stalling update. It's not so much hassle and you can reload your stuff quickly. And, don't use a pattern, use a pin to be safe.
Unfortunately my Quest won't connect to my phone until the unlock pattern is entered, so I can't backup or change device settings. I can't do anything in the headset until the unlock pattern is entered. I don't have anything very important on my Quest that needs backing up, so a factory reset isn't the worst, but there may be others with a different situation.
I'm seeing more and more people on reddit asking about the bug, so it's something Meta devs should address.
What if you opt out of the PTC, you might get the correct lock pattern template back? Then you could hopefully disable the lock and then opt back in to the PTC?
Edit: Oh, I just saw your comment in another thread that you can't opt out from PTC because you need to unlock the headset first. Darn. 😒
