Summary
The Breach and Density enchantments aren't mutually exclusive, which is currently not made on Java, but it is on Bedrock right now, creating a parity issue.
Steps to Reproduce:
Get an anvil, place it down.
Get a Density and Breach enchantment books.
Get a mace.
Put it together in an anvil.
Expected Result
The enchantments shouldn't be combined and are mutually exclusive.
Observed Result
The enchantments still can be combined and are mutually exclusive.
I can confirm, in the video there is a creative mode but on survival it also works