Nether sprouts can float in the air when the block beneath them has been destroyed. For whatever reason I cannot attach a screenshot to this post.
Exact experience: while under frequent attack by ghasts, in a warped forest biome in the nether, I was removing warped nylium and the (blue) nether sprouts atop the warped nylium remained floating in the air.
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Glad you searched yourself, do try to search before reporting though. This issue duplicates MC-170844. You'll have to wait for a volunteer to resolve this issue as a duplicate, so please be patient.
Just found the actual search field (had been trying to sort by version) and saw that this has already been reported. My bad. Can't figure out how to delete/close this bug report.