Several beatmaps have mismatched MD5 checksums between API and downloadable .osz file

[quantizedSpacetime]

This issue is functionally identical as far as I can tell to a previous issue, raised at ppy/osu-web/issues#6407, but I'm separating this because it involves a wider set of beatmaps than previously mentioned.

Some beatmaps have mismatches between the .osu file found in the .osz when you download off the website and the "true" most up-to-date version found, for example, on osu.ppy.sh/osu/<beatmap_id> or through an API request. This causes the checksum of the file not to match the expected checksum after download. I've identified the issue for all the following beatmap ids (not exhaustive, only ones I've found through playing):

Beatmapset ID	Beatmap ID	Checksum by API request (correct)	Checksum from .osz download (incorrect)
54	141	ac6e971d689e87e12d8c170e1f5b31ff	50791b017c9d43382403f343fdb62c77
55	162	eb3580e42f8510117fc2df91b71e2e73	74c29c4a354125c5f53ac73dc2c5c1a7
56	164	2ef0fe54648fb149dab9580df6d06080	6b4fd1917a8093f70c2174104788265e
57	144	7c9eb2fcb5667d00eb7edf317f260adf	c8d807d2d0da513b2d0bff9c133548e9
58	146	306fd57cabaf6ede45e2513800becc59	f9bb3d924ee9ce4d2e0e77bc55e29e83
59	147	21b4a375d307258be868737b7f1d5d6c	05edf9da65e6652bf5954deffc2c5723
62	200	010ed9fe027189be566ccae344f401de	8e511a406999252f108afc2ffbc3911e
63	250	3275bc96a887eebf3229f4e960e53bfc	2c292eeb874fffc5d11f639a5805a320
64	195	ffb857952109af9ff1b958c3055d8f14	fcf6f7640c0e434306554262f9ea2bee

I confirmed that the issue can be fixed by importing files downloaded from the osu.ppy.sh/osu/<beatmap_id> link directly, meaning that it's an issue specifically with the downloadable .osz and not a more general problem.

All of these are from October 8th/9th 2007, but I don't know if that has anything to do with it since the map from the original issue is not a 2007 map. It's possible, though I'm not qualified to know for sure, that this is some systematic issue with old maps because these beatmaps represent nearly a third of all the beatmaps submitted on those days. Regardless, I think the .osu inside of the .osz download should be updated just like the issue cited above for each of these.