Yes, I know about loading old worlds in new versions, but it is still strange
Maybe the world tried to load the new structures from the second screenshot? (fresh new 1.16.3 world)
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-191516, which has been marked as Won't Fix - while this behaviour is not desirable, the developers have said that they will not or cannot fix it.
Please use the search function in the future to prevent duplicate reports.
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Please provide the seed and coordinates, as well as the version you originally created the world in.