Summary:
Hitbox pitcher plant doesn't match the bedrock and is too big.
Its hitbox, according to the bedrock, should be randomly placed in the block (to match the placement of the flower) and have dimensions of 6x6x26 pixels.
This will correspond to the actual size of the flower and in my opinion it will be correct.

Steps to reproduce:

1. Place the Pitcher Plant.
2. Look at his hitbox.

Observed results:
The hitbox consists of a full two blocks.

Expected results:
The hitbox will match the flower and bedrock versions.

Screenshots: