Four new blocks can generate on the magma and netherrack from ruined portals

Relates to MCPE-69219 and MC-280098

Steps to reproduce:

1. Create a world with the specified seed.
2. Visit the specified coordinates.

Observed results:
Notice that wildflower or leaf litter have generated on the ruined portal.

Expected results:
Wildflower or leaf litter should not be generated on the ruined portal.