[MC-179824] Optimizing an old world crashes the game

I tried to optimize a world from 20w16a, and the following crash report happened.

Linked issues

Duplicate of MC-179841

Thank you for your report!
We're actually already tracking this issue in MC-179841, so I've resolved and linked this ticket as a duplicate.

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Oops, sorry, I was too fast when I wanted to create this issue and I forgot to search for it.