When on land, axolotls still have a swimming animation. Therefore it often looks like their head / tail is in the ground while they're walking around.
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Can confirm in 21w03a.
Can confirm in 21w05a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w08b.
Happens to me too. Very frustrating because they get stuck and die.

Affects 21w13a
Can confirm in 21w14a.

In 21w15a
Can confirm in 21w15a too

Affects 21w17a
Can confirm for 21w20a
Applicable screenshots at MC-208673