These blocks generate when a block ID cant be found because you’re playing an older version without those blocks. The first time they appeared was in place of fire. They were also used to replace magma blocks later. They’re there to remind you to update the game, whilst also generating where the new feature would go. They’re also only found on bedrock edition.

Update!

upd ate!

Update

Wait why have I never realised that the block actually says update on them.

When a mod doesn’t work properly or you remove a mod, all the modded blocks will look like this

1917, october 7, 1:56:am.