I was streaming Minecraft on snapshot 21w06a, here is short clip from it.

https://youtu.be/3OV_tzislrI

Timestamps (also in video)

On 0:17 I build a bridge

Then I go to my another house up to 1:50 where I missed my horse and decided to rejoin my world. After that, I went to the first place where there was the bridge.

3:37 there is no bridge.

4:56 you can see last blocks I point on blocks I placed just before building the bridge

What actually happened was...:
My bridge dissappear, no ghost blocks, my previous blocks are still there.

Steps to Reproduce:
I have no clue.