The stems of pink petals and wildflowers worn on copper golems' heads are gray

Steps to reproduce

Execute one of the following commands to summon a copper golem with pink petals or wildflowers in its head slot.

summon minecraft:copper_golem ~ ~ ~ {equipment:{head:{id:"minecraft:pink_petals"}},NoAI:1b}

summon minecraft:copper_golem ~ ~ ~ {equipment:{head:{id:"minecraft:wildflowers"}},NoAI:1b}

Observed behavior

The stems of the pink petals or wildflowers will appear gray.

Expected behavior

The stems would be colored, as is the case for other biome-tinted blocks (sugar cane, leaves, short grass).