[MC-231274] Grass and flowers can generate on netherrack on ruined portals

Grass and flowers can generate on netherrack on ruined portals despite the fact you can't naturally place it on them.

Test:

Enter this seed: -3228514139489554198

Go to the coordinates: 117, 64, 94

Grass and flowers generate on the netherrack

Linked issues

Avoma 2021-07-06T08:55:54Z

Duplicate of MC-226027.

Arisa Bot 2021-07-06T19:13:09Z

Thank you for your report!
We're tracking this issue in MC-226027, so this ticket is being resolved and linked as a duplicate.

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