MC-153483 refers mainly to a trident texture not transferring properly between hands, whereas MC-159820 refers to a trident texture being inverted when it is fired for the first time.
Some parts of the bugs are similar, but I believe mine is a separate issue. I went back and tested it again, and pulling back a trident in the off-hand also triggers the bug.
MC-153483 refers mainly to a trident texture not transferring properly between hands, whereas MC-159820 refers to a trident texture being inverted when it is fired for the first time.