The bug

Tall grass and large fern carried by an enderman is rendered gray.
It appears other blocks which use the foliage color (e.g. grass or vine) are not affected.

Reproduction steps

1. Summon an enderman holding the affected block

   /summon minecraft:enderman ~ ~ ~ {NoAI:1b,carriedBlockState:{Name:"tall_grass"}}
   

   /summon minecraft:enderman ~ ~ ~ {NoAI:1b,carriedBlockState:{Name:"large_fern"}}
   

   The carried block is rendered gray