Sorry, I should've mentioned @thomas.ormezzano and maybe @borkdude. But yeah, I've seen this behaviour and I was like "meh, it's different but bb is different fundamentally" so I was personally okay with checking the running process for stdio. Could be cool to have this as an option or replicated to the nREPL client by default though!
If you can make a repro and post it at the babashka/babashka.nrepl repo or borkdude/babashka I'm willing to look into it
if it's an issue with the bb nREPL implementation