Discovered while testing MC-270989.
The bug
If a 1.12.2 world containing snow golem spawn eggs or iron golem spawn eggs is upgraded to 1.20.5, they do not become the proper IDs for these spawn eggs, and instead become pig spawn eggs.
How to reproduce
A 1.12.2 world with many spawn eggs is attached to this ticket.
Load this world in 1.12.2
Check the spawn eggs in the leftmost chest
Upgrade to the latest development version
Check those eggs again
Expected results
The iron golem and snow golem spawn eggs would become proper iron golem and snow golem spawn eggs.
Actual results
They instead become pig spawn eggs with extra components.
Linked issues
Attachments
Comments 2
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Sounds strange.