Minecraft not visible blocks?

Could you help me with the pe these blocks invisible I can still on the blocks but I can't see them?

That happens to me sometimes just close and open again when I'm always there to restart PC or cell phone

Either the world doesn't load fast enough, sometimes I do

Or they are deliberately built barrier blocks that you can only see with the corresponding block in hand.

You can get it with / give NAME barrier

if you hold it in your hand you can see it better

The world is still fully loaded, have to fly away and fly again

Maybe that's some bug [or how it's written. ]

It could also be that you gave a command to activate the invisible blocks…

Otherwise you could restart the app on the PC / mobile phone.

Doesn't work