This appears to have been resolved since at least version 1.21.
Sorry, should've provided the command used in the original post—my bad.
Here's the command:
/summon item_display ~ ~ ~ {billboard:"center",item:{id:"minecraft:light",count:1}}
I should also mention that this issue cannot currently be counteracted by using a transformation component to rotate the model 180°, as it creates a visual bug. (MC-272073)
@Jiingy is correct; my bad. The issue can be closed.
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
Minimal, but I can see where you're coming from. Very minor if it is considered too quiet though. 😛
Can reproduce. But, have we considered that the frogs are maybe just excited? :^)
Can reproduce
This is intended behavior as described in the snapshot's article:
https://www.minecraft.net/en-us/article/minecraft-snapshot-22w45a
Added Block of Bamboo and Stripped Block of Bamboo
Block of Bamboo can be crafted from 9 Bamboo and can be stripped like other wood logs
Bamboo Planks crafted from Block of Bamboo yield only 2 planks compared to 4 for wood logs
This appears to have been resolved since at least version 1.21 since rails now break when a shulker box is opening underneath them.