The texture of the sculk sensor in the hand and at the time of putting the block is very different from the inventory, it is from the 20w49a and I think it is a bug.

I thought I would have those 4 tentacles but in inventory it only has only 2

1. When looking for the sculk sensor in the inventory it appears with 2 ¿tentacles? I think that's what they are called
2. When I have it in my hand I see that it has 4 tentacles
3. When I place it on any block it still has 4 tentacles
4. But the inventory only has 2 tentacles