Instacrash when triggering buf2list on MSVC Debug Build

[lewardo]

Instacrash when triggering buf2list on Windows MSVC build and local flucoma-core repo, the issue doesn't show up on Mac

minimal patch to recreate crash, to recreate trigger bang (renamed to .maxpat.txt since gh doesn't accept .maxpat uploads in issues for some reason)
crash_buf2list_test.maxpat.txt

Call stack on crash

issue seems similar to #371, still crashes having pulled #372

[AlexHarker]

1 - Do we have an error code or message - was this an indexing assert, by any chance?

2 - hopefully you might have picked up by now on how to copy compressed and pasting as text for small testing max patches... [if not let me know]