When you try to use backspace in an anvil when renaming an item, it does not work. Backspace key normally works fine, just does not work in anvil.

This is definitely a very major bug

It also duplicates MC-266886

1.20.3 pre-release anvil Text error, however that is in german so I am doing one in english

Steps to reproduce:
1: Get an anvil
2: Get an item
3: Try to rename it. Backspace will not work

I will provide a translation of the original report by HerrPeter here:

Hello dear Mojang team, I found a bug in the latest pre-release version of Snapshot version 1.20.3

Normally you can rename items such as name tags or other items, but this is not possible. This needs to be remedied immediately.

When I press Backspace or Ctrl+A and press Backspace, the element's letters cannot be removed. I can't change my name to Shed.

Steps to reproduce:
1. Go to an anvil and place an item in it.
2. Remove the item name.
3. Now you understand what I mean.