Netherite Gear Disappeared

I flew into a wall that hadn't rendered yet in the nether and fell into lava. I died but was able to get the coords down and get back there after respawning. I was only able to find 2/9 pieces. The Chest plate and shovel were all that remained. I had multiple fire resistance potions with me and spent 20+ minutes searching the area to make sure they weren't overlooked. 
Please advise as I thought this wasn't supposed to happen with this gear which is why I farmed the Ancient debris. to prevent this from happening