I lost a maxed out sword do to a bug

Hello I have a big problem I had a maxed out netherite sword with sharpness mending soul collector fire aspect looting and sweeping edge (If i'm not forgetting anything) and i was showing it to my friend in a trade but then i accidentaly picked up some rotten flesh and then i ended the trade my inventory was full and it didn't give me my sword but a message popped out saying that i coudn't pick up the item because my inventory was full and to click to get it but i didn't work.