And it turns out you can slice y0 portals or something like that using those according to discussion in carpetcord.

There may be other invalid blocks that can be created that should be looked at.

would it be solved by giving a block update to the block? This would (I think) also solve the case of say slabs with levers on top being flipped

Half of the rule is it not sending updates though.

well nvm lol...

Wait, which exact problems would be caused if flippinCactus caused block updates?

Idk, but the feature description mentions that's how it works, so it'd be changing the feature.

ye but to fix this we need to update the block somehow, even if it's by checking whether it's in an invalid state. Therefore I move that we see what exact problems would be caused by this

https://xkcd.com/1172

Edit: Wow how did I mess up xkcd?