The Bug:
Pitcher plants aren't part of the #minecraft:flowers or #minecraft:tall_flowers block tags.
This causes a variety of issues as follows:
Bees are unable to pollinate from the block.
Bees are unable to be tempted or bred from the item.
Saplings grown next to the block won't have a chance to generate a bee nest.
Data packs calling upon the item or block tag won't have pitcher plants as affected.
Steps to Reproduce:
Place down a pitcher plant.
Enable the F3 debug screen and look at its block tags.
Take note as to whether or not pitcher plants are part of the #minecraft:flowers or #minecraft:tall_flowers block tags.
Observed Behavior:
Pitcher plants aren't part of the #minecraft:flowers or #minecraft:tall_flowers block tags.
Expected Behavior:
Pitcher plants would be part of the #minecraft:flowers or #minecraft:tall_flowers block tags.
Believe this relates to MC-261243.