flipbook_textures.json does not support animating multiple variants of a same block and only animates the last entry for that block.

Basically the title. If I animate for example poppy1 and poppy2, only poppy2 will be animated.

How to reproduce:
Download example pack below, activate it in a world and place poppies until you have both variants.
Supposed Results both variants are animated (each poppy should have the same color)
Observed Results: only "poppy2" is animated