Yup they float and it doesn't look right. Knowing my luck, this was already reported.
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Relates to MC-92274
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w08b.
Can confirm in 21w10a. Video attached.
Can confirm in 21w11a.
Can confirm in 21w13a.
Can confirm in 21w16a.
Can confirm in 21w17a.

The way
a simular issue about pointed dripstone was fixed was by applying the different holding position (the one used by tools, sticks, bones...). Same could be applied to hanging roots as well.