When you unlock custom recipe through a custom advancement, it unlocks every custom recipe.
I tested it out with every recipe function from Vanilla Tweaks (pack format edited to 8) and a few other data packs.
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In the mp4 video I uploaded, I only had 1 data pack installed and active which is the other upload "pack_I_used.zip".
This is most likely due to conflicting datapacks. Unfortunately we cannot help you this issue here.