On 29 Jul 2018, at 16:57, Kevin Reid wrote:

I can't confirm right now because the problem is not happening (it's
intermittent and I haven't identified a cause).

Try run something like this from a terminal to see if it is reproducible:

for (( i = 1; i < 50; i++ )); do echo -n "Edit $i..."; mate -w "/tmp/test $i.txt"; echo "Done!"; done

I did this myself but only issue I saw was that sometimes TextMate wouldn’t activate, mostly addressed in these two commits: https://github.com/textmate/textmate/compare/cc9faa602...d93972f95 and should only hapen when `mate` is used in succession.