Worlds created in the alpha level format (prior to beta 1.3) are seen as corrupted by 1.21.8, while they actually work fine. Unlike Mcregion world files, which are recognized but cannot be converted, new versions of Minecraft don’t recognize the alpha level format at all.
Environment
Windows 10, bundled JRE, Intel i9, RTX 4090, 32 GB RAM
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Thank you for your report!
We are tracking this issue in MC-298939, so this ticket is being resolved and linked as a duplicate.
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This also applies to worlds created in the June 24th, 2010 format