Ah the joys of developing a Mac build on Windows. Hmm I just used 7zip thought it'd handle it. We didn't have an issue with the Headliner mac version so I'm curious if it's Unity export that messed up?
Possibly a change to Unity, yeah. I've noticed a lot of newer indie games having this problem on itch lately.
Could be. Thanks for the heads up tho, if we hear more reports in future releases, at least we know how to fix it :)