This was fixed by handle repository.size column being NULL in migration v263 by thenaterhood · Pull Request #28336 · go-gitea/gitea · GitHub
The reason it is fixed in Forgejo is because they have a released version with the fix in it and we are currently waiting on a few backports.
1.21.2 changelog by techknowlogick · Pull Request #28387 · go-gitea/gitea · GitHub
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