In Minecraft snapshot 20w10a, anvils cannot be used to rename items, as clicking on the tan name bar does nothing. It does not bring up a cursor to type a name with. Otherwise, anvils function correctly. The issue affects both Survival and Creative mode, and appears to affect all items.

This was discovered when I attempted to rename a name tag for later use. I tested further with multiple items in Creative mode, and none could be renamed.

This issue does not appear to be present in 20w09a or previous development versions.