Control Strip buttons sometimes just don't show up

I've been meaning to customize the Touch Bar more, but for some time now, I've simply had one Control Strip button and that's it.

But sometimes, it just... doesn't show up.

There's probably some sort of pattern to it, but if so, I haven't discerned it. Just now, I noticed it missing. I tried relaunching BTT to no avail, as well as dis/re-enabling the button in BTT.

Any idea why this is happening or what I can do to troubleshoot?

P.S. I tried tagging this touch-bar but it says "Tags is [sic] invalid".