The bug
The new block minecraft:pink_petals is intended to represent an aggregate of small flowers, as explained in the 23w07a blog post. However, unlike all other flowers (excluding spore blossoms, which do not grow up from the ground and therefore likely don't count), they cannot be placed inside of flower pots.
How to reproduce
Obtain minecraft:pink_petals
Obtain a flower pot
Attempt to place it inside of the pot
Expected results
It would go in the pot.
Actual results
It does not.
You tell me how that would work.