The above mentioned blocks and items ids (including all metadata) cannot be copied and entered into a trading/loot table as is. All other items/blocks with their own specific id ("block_xp_solidified") work.

Wat. This isn't even valid. They are just normal items.

No I mean, when you input any of the blocks/items with a "misc" in their id into a custom villager trade, it doesn't work.... for example the full code would be something like this: "{action:"add", CareerLevel:1,buy:{id:"minecraft:cobblestone",Count:1},sell{id:"actuallyadditions:item_misc",Count:64,Damage:0}}. But it doesn't work. This does though:
{action:"add", CareerLevel:1,
buy:{id:"minecraft:cobblestone",Count:1},
sell:{id:"actuallyadditions:item_solidified_experience",Count:64}},