first of all I am writing this with Google translator in case something is misspelled.

When I paste a construction with entities when I raise them to height -48 onwards they disappear while the ones below this height are still visible. Is this a mistake?

version 1.19.3

I'm also using Google Translate to write this text, there may be spelling mistakes
Litematica 1.19.2 also has this error.

This was a bug in the 0.12.6 version for 1.19.2 and in the 0.13.1 version for 1.19.3. I now released 0.12.7 for 1.19.2 and 0.13.2 for 1.19.3 that have a fix for this bug. (And the 1.19.4 release also has the fix.)