Hello EmanuelCN .Did you enable magisk hide ? also hide magisk package (renaming the package) they are both in magisk settings, as for gapps i use bitgapps. Also you are using wrong build you are not using "dotOS-R-v5.1.2-judyln-UNOFFICIAL-20210718-1522.zip", Recheck download link i've changed it from the google drive as our server was down for couple days.
Do you have a direct link to download the Pixel Experience Rom for LG G7??