When looking at a Yucca Palm Sapling placed in a Flower Pot with Hwyla enabled, Hwyla will label it as block.terrestria.potted_yucca_palm_sapling, as opposed to a proper name. I examined all of the other potted saplings, and this seems to affect the potted Yucca Palm sapling exclusively.

Tested in version 1.16.1.

Looking at the code, this was fixed, so I will close it now.~