When update map from 18w16a to 18w21b, spawn a zombie under a block which was placed in 18w16a.
Afterward, the zombie is on fire.
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Thank you for your report!
However, this issue has been closed as a Duplicate.
It has been linked to MC-129725. If you have additional information, please add it to the duplicated report.
Please search before reporting, as it's likely that one exists already.
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