Guardians treat lava as if it were water and try to swim at the top of source and falling blocks.
Bug not present in version 1.13.
Environment
Java, Windows
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're tracking this issue in MC-151929, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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WAI: MC-151929