Datapack loading executes on Render Thread

And what kind of inconsistencies does it cause exactly? I am not seeing any error messages relating to it, I'm actually not even sure what this report is about exactly.

Datapack files do not load consistently; they sometimes don't get applied (for loot tables/recipes) or executed (tick.mcfunction). The problem being that there are no error messages, just a cryptic message that the Render Thread is loading datapacks for some reason.

Could you please attach the datapack so we can have a look what might be wrong?

Attached the datapack; just made sure it works... In 1.14 and 1.15 it starts flawlessly.
This specific datapack does not have a tick.mcfunction, however, I confirmed them being sometimes broken with different datapacks. Also it does not only affect my datapacks but also randomly packs that have been found working in previous versions.