Trident are expected to stay on the ground and unload before land so that they don't fall into the void but they deload upon entering a portal or unloading chunks. Trident killers or tridents left on the ground despawn.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're tracking this issue in MCPE-167769, so this ticket is being resolved and linked as a duplicate.
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