Wither Skull and Wither Skeleton textures are broken

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.

We do not have enough information to find the cause of this issue.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]) here.

Once attached, the report will be reopened automatically.

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Please check if that's still an issue in 1.15-pre1 or higher.