In 1.16.2, the way that fungi work was changed a bit. Now all fungi types, namely in vanilla: brown mushrooms, red mushrooms, warped fungus and crimson fungus can be planted on blocks with the tag #mushroom_grow_block. The reserved behaviors for fungi are only growth ones, meaning normal mushrooms can grow in any but specific fungi, like the warped and crimson fungi and glowshrooms should only grow on their specific blocks: warped and crimson nylium and glowcelium, respectively.
For this inconsistency to be fixed, basically, glowshrooms should be plantable on any #mushroom_grow_block but only grow on glowcelium.