Hey!

I'm not sure this is actually a Tool Progression issue, but I thought I'd let you know regardless.
Ores from Netherending Ores and NuclearCraft cannot have their harvest level altered by Tool Progression. I've opened issues on their respective issue trackers, and it looks like they're not at fault.

Additionally, I have previously been able to alter the harvest level of NuclearCraft ores, but lost the ability to do so 1-2 months ago.

Minecraft 1.12.2
Forge 1.12.2-14.23.2.2624
toolprogression-1.12.2-1.4.7

Both mods override the method public int getHarvestLevel(IBlockState state) of their Blocks without also overriding the corresponding setHarvestLevel appropriately. This is on their end, though I might be convinced to hack something together if enough people need it.

I was convinced I had replied, sorry about that.

Thanks to your tip, both mods are working to fix it, thank you.