From what I've tested while playing with BetterNether and BetterEnd, every ore (Including ancient debris) except for these four:
Amber ore
Nether lapis ore
Nether redstone ore
Nether ruby ore
gets automatically smelted when mined with the Fireruby pickaxe due to the Rubys' Fire enchantment, even if that pickaxe has the Silk Touch enchantment on it.
I know that's how the Rubys' Fire enchantment works, but I feel like it would make more sense to stop the auto smelting from happening if the pickaxe has Silk Touch on it, I had to switch to an Aeternium pickaxe with Silk Touch in my server as I couldn't rely on the Fireruby one.
Description
From what I've tested while playing with BetterNether and BetterEnd, every ore (Including ancient debris) except for these four: