Mods and Advancement

I wanted to know if adding data packs will remove advancements ? Because when I am playing using modrinth launcher and few days packs my Vanilla advancements are gone

If I have data packs and mods on then if I switch to creative and back to survival will I loose ability to earn advancements?

Is there any way to lock a world in survival ?

What happens if I add data pack of VANILLA TWEAKS such as MOB HEADS then when 1.22 realses and when vanilla tweaks realses 1.22 version then how do I replace old files of data pack with latest one without losing items in the world ???