I don't know what is it but ramdomly appears blocks like in the attach. Also every time this happens my minecraft freezes and I have to close and open the game again. I don't know why this happens when my world is always above 60 FPS.
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I have seen 2 similar reports recently. MC-229961
If I find the other I'll try to link it.
This is caused by an outdated graphics card driver that is not supported anymore. Update drivers, but if it doesn't work, please buy a new graphics card.
Mojang has an article on how to update graphic drivers. If you need help please ask at Discord.
What's your specs?