I just ran a /locatebiome command for a ruined portal, and there is no ruined in the vicinity at any y level. Check the attachment below to see my coordinates and the coordinates Minecraft gave me.
Environment
Latest Java version, Windows 10
MC-187383
/locatebiome command has broken.
Resolved
Duplicate
0
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-178842.
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