Ah, now I get it. I think this is https://github.com/timholy/Revise.jl/issues/337. I could have sworn I fixed that, but I must be thinking of something else.
I think the problem occurs when Revise tries to revise a package it itself depends on. It should only happen when JuliaInterpreter, CodeTracking, or LoweredCodeUtils updates, and probably not all the time even then. I will see if I can get to it at some point.