21w03a adds glow lichen, which very tightly adheres to the face of the block it's on. Compared to redstone dust and lily pads, this is also likely how tight they should hold on to their block space, but some closer inspection reveals a gap.
How to fix
The resource pack attached to MC-237445 fixes this issue completely, alongside fixing multiple other issues with flat plane models.
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well minecraft doesn't exactly have gravity... but it sure does look weird. can confirm for 1.16.4 and 1.16.5
Can confirms, would like to add that the lily pad's floating is even more extreme on water blocks (the gap is very visible)