Just sent an email with a bunch of files that'll hopefully help track this down. Totally understand that it may take awhile to get a fix in. Hope the game launch is going well!
I just released a new version, but the fix for this isn't included unfortunately. I tested GM Link with your aseprite file and the newest LTS version of GM and everything worked perfectly, so I wasn't able to reproduce it this time around. Hopefully we can come close to the root cause soon so it can be smashed. I'll continue pondering about what could be causing it.