Seems like it. It generates the save file. Looks to be a base64 encoded binary blob.Save to Disk has always worked for me for many twine games.
It should generate a text file named apocalyptic-world-yearmonthday-hourminutesecond.save, default location is in your downloads folder.
Obviously, one of your blocking apps/etc is the problem here.
Doing more research, regardless of the number of saves in the game, the save file export seems to be identical every time. (as in checksums identically every time. 1 save, 5 saves, 8 saves. Always identical.
Guessing that is the root of the problem on my end.
Code:
$ sha256sum apocalyptic-world-20240606-22*
d8cb925389f5e581c271e45fa18e49890970fcddf2eb3cd083749aa5842cfbc0 apocalyptic-world-20240606-220833.save # 1 save
d8cb925389f5e581c271e45fa18e49890970fcddf2eb3cd083749aa5842cfbc0 apocalyptic-world-20240606-220841.save # 5 saves
d8cb925389f5e581c271e45fa18e49890970fcddf2eb3cd083749aa5842cfbc0 apocalyptic-world-20240606-220848.save # 8 saves