Blocks become " intangible" at random!

I noticed that may block become ghost blocks at random (most of the times after flying w/ elytra) and you can walk through them! Only blocks in the head's level can become intangible and they can be mined normaly, but onced placed back, they become again... The property stops at random as well

Steps to Reproduce:

1. There is no specific steps to reproduce, try flying w/ elytra and bumping into blocks!

 

Screenshots/Videos attached: Videos show a ladder having this weird property and some naturally generated wart blocks!