I see. Yeah, I've seen this.

It seems more likely to happen when the profile has been running for a long time (a couple weeks?) and/or using a large amount of RAM.

There's a 60-secish timeout before it gives up and pops that crash report window. I don't think it's a crash per se, just an unresolved file lock or similar. I haven't noticed whether there's any relationship to running multiple profiles. I am almost always running several at a time, and the issue only occurs sometimes. It has no (other) negative side effects, as far as I can tell, but it was unsettling at first.

I'm on macOS also, and I launch from the command line (effectively, I actually have separate launchers for each profile, but they just run a shell script with different arguments).