The new stem's texture is not touching upper leaf of small dripleaf plant. That causes leaf to look like floating in air.
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21w07a!
small dripleaf stem seems unconnected with leaf part.
should be fixed.

Confirmed in 21w08a

Confirmed in 21w10a
Can confirm in 21w11a.

In Bedrock Edition, that model is correct. The reason for this issue is that the texture mapped of the stem has a height of 16, even though the model has height of 14, And the result is that the texture has shrunk by two pixels.

Seems to be fixed in 21w16a...

Yes. However, a new model problem has arisen.
In the new model, the top model and bottom of stem are not properly connected.

@unknown make a new issue for that if one doesn't exist already
I can confirm.