vilagers trading technicals crash game

I have a shop with villagers calibrated to not have a final trade, meaning they have a trade of Block 36 for block 36 at the end, this is so players on my server can't add new trades to them. when I go to these trades the game will crash as a result of the removal of technical blocks.
It is still occurring, and i must say the game is not modded even though the crash report says that, I just downloaded a new clean jar to generate that one.

To reproduce:
NBT edit in a villager that trades a technical block for a technical block EX: 36
attempt a trade
Crash it