Hello, i'm having the common issue of chiseled blocks dissapearing after reconnecting or leaving the chunks, but not all of them, just some specific blocks (they are still a lot of blocks).
I'm playing 1.12.2, no OptiFine
Mod list:

I'm really sorry to bother here with an old version but it's the only one where i can gather all this mods together, if it's necessary i'll remove anyone. Thanks.

PD: I've played a few worlds with the same modpack in the past and i didn't have this issue.

Sorry 1.12 is not supported any more.