Ruined portals in the Nether generate with Polished Blackstone on Java, but Nether Brick on Bedrock
When a ruined portal generates in the Nether, it generates polished blackstone for Java Edition, but Nether bricks for Bedrock Edition. To reproduce in the latest Java Edition snapshot, use the seed -2827766514992215083 and run the following command:
/execute in minecraft:the_nether run tp @p -348 60 -222
Information of how to reproduce for Bedrock is in the comments.