i discoved a weird bug in 1.17 that also appears in 1.13 java edition, this glitch is more of a problem in survival than creative as tridents are not consumed when thrown , but in survival it is, as tridents are consumed when thrown, and are a very rare drop to obtain.

i discoverd when testing what would happen if a trident was pushed by pistons and while setting up the pistons i relized the trident i placed de spawned , at first i wasnt sure so i threw down another trident in creative mode and watched it despawn, i switched to survival and did the same test and it despawned again idk if its because i was on a superflat world but i wouldnt be surprised if it despawned on other world types, i only tested it on superflats, i understand it despawning if it was trown in creative but i feel that since tridents are so rare that if thrown in survival by a player it should not despawn 

I also tested it on both 1.13 and 1.17 versions creative and survival, so it been in the game for a bit, i know its a little late to fix 1.13 but thought it would help

also i had recorded to videos showing my tests but the where both to large to upload to the page