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What type of PR is this?
Bug fix
What does this PR do? Why is it needed?
PR #13827 introduced a bug where the data availability check will panic on blocks where some blobs are available locally, due to allocating a list that is too large when not all commitments need to be checked. This PR fixes that bug, adds some unit tests and tightens up some of the ROBlock/Blob constructor logic.
Thanks to @nalepae for noticing the panic in local testing and @prestonvanloon for identifying the fix.