Summary:
You cannot use mangrove planks, crimson planks, and warped planks to repair damaged shields in an anvil, which is inconsistent with other planks.
Steps to Reproduce:
Obtain a damaged shield, mangrove planks, crimson planks, and warped planks
Place and open an anvil
Try to repair the shield with the planks
Observed Results:
The shield cannot be repaired.
Expected Results:
The shield should be able to be repaired.
Screenshots:
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This might be because the id for nether planks is different from the regular planks id. I haven't tested the mangrove planks part but i think that maybe mangrove planks might have a different id.