In this version, when you click in the Minecraft Launcher "1.20.5-rc2", it's launching 1.20.5-rc1, the Treasure Map is Empty Map, Wolves are grey in the Forest Biome.
Comments 3
It launches 1.20.5 Release Candidate 2 for me when I click on "1.20.5-rc2" and launch it from the official Minecraft Launcher.
Also, assuming you had 1.21 experiments disabled (which I did while testing your issue), wolves in the forest spawn as the correct variant (woods wolf) and buried treasure maps show up normally in shipwrecks.
Sometimes treasure maps can show up as empty maps if the shipwreck cannot find a buried treasure.{*}*
Perhaps share the seed of the issues you were experiencing, as well as the coordinates of the area where the issues occurred?
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However, this issue is Invalid.
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Bugs in the Minecraft Launcher do not belong here.
Also please provide steps on reproducing such bug(s).