The block of bamboo has the same texture as the stripped bamboo block, which looks odd on the edges of the bamboo block, going from the green on the side to the dramatically different yellow.
MC-257375
Block of bamboo uses top texture of block of stripped bamboo
Resolved
Works As Intended
3
Fixed in 22w46a, not "Works as Intended"
"Added new top textures for Block of Bamboo and Block of Stripped Bamboo"
https://www.minecraft.net/en-us/article/minecraft-snapshot-22w46a