When I place any block from your mod and then try to mine it (with required tool ofc), that block doesn't drop anything.
I think it's because wrongly named loot table json files, AFAIK they have to match block name and in your mod that doesn't seem to be the case.
With /setblock command, I see that every block name ends with _block, but your loot table files do not end with _block.

Thanks for the report, if you check the git pushes you can see that I just did a major rewrite of the entire mod and these must have been forgotten f1a0728
It's easy to miss things when you have pushes like this