I... Don't know. I never considered locking a bootloader purposely. Let alone while it's running a custom ROM. Either it'll just get locked in on the ROM (probably removing root) or it'll create a vacuum in your house which will eventually implode and drag your entire neighbourhood to bits.I don't know what was wrong with my magisk hide. It was not working properly.
I had same setup but with stable OOS but until I deny Google Play Services Telephone Access, mobile payments never worked.
Moreover after denying that access other apps behaved abnormally.
Also I was successful to relock my bootloader with the command. If it wasn't stock then my phone would have been bricked. Correct?
It could also deny the lock command, let's hope Android chose this path. You'd most likely have to unlock again if it did work.
Google clearly doesn't like being denied access ?
Anyway, telephone access is commonly needed and usually it's merely used to read phone state so it can handle interruptions by an incoming caller properly. Big G also uses this permission for when you shout 'Hey Google, call my ex and then hang up in her!'*.
*Not an actually working command. Believe me, I've tried.
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