[Nintendo Switch Operating System: 10.2.0]
When using the fill command while standing on top of an anvil (/fill ~ ~ ~ ~ ~-1 ~ air 0 replace anvil 0), it returns with an error: "0 blocks filled" even though the anvil's data value is in fact 0. Command blocks are also unable to do this.

The setblock command works, it's just this one

And all data values for anvils (0, 1, 2) does not work with the fill command...

Steps to reproduce:

Place an anvil

stand on top of the anvil

type in the command provided above