AR Foundations: Tracking ceases to function in builds until editor restart

I'm wondering if anyone else has run into this before?

EX: You're plugging away implementing and experimenting with features in AR Foundations, suddenly tracking ceases to function in your builds for Android. You've been using Build an Run and it's been working perfectly up til now. You don't get any errors and everything seems fine and maybe you think that something is wrong in your code. Though no matter what you do nothing seems to fix the issue.

You close and reopen the unity editor, make a build, and suddenly everything is working again.

I'm using unity version 2018.3.5f1 but also saw it happen in 2018.3.4f1. I'm using ARFoundations package 22.