This happens to me, too on Ps4 edition, but I usually place a block on the shadow and it updates, I can then remove the block and it works as normal.
I am in hard difficulty
There is a black square around xp orbs in ice spike biomes, when the orb is on the packed ice/ice ; in 1.16
I can confirm it affects Ps4 edition on 1.16 version
Is it linked to a workstation or a bed?