The Bug
The advancement descriptions for "Wax On" & "Wax Off" states to wax/wax off a copper block despite you being able to get the advancements from the copper stairs & slabs
Expected Result
The advancement description to just say copper instead of copper block
As noted by the bug marked as a duplicate, "copper block" isn't actually the name of any individual block in the game. (It's "block of copper")
a copper block may mean any block made of copper, rather than specifically the full blocks
but I agree simply "Apply wax to copper" and either "Scrape wax off of copper" or "Scrape wax from copper" would be clearest and simplest
*Note also:* these are the only advancement descriptions that end in "!". (Not worth its own ticket)
May also relate to MC-187546 or MC-226430 , as "Copper" should be lower case for consistency with other advancement descriptions.
If you wouldn't mind adding this information to the ticket body, including stating what the full text of these strings should be, that would likely simplify things for whoever fixes it.