Item display interpolation does not interpolate correctly in 1.21.5
Run /summon minecraft:item_display ~ ~ ~ {item:{id:"diamond"}} to summon an item display.
Run /data modify entity @n[type=minecraft:item_display] teleport_duration set value 50, it will change the interpolation duration of display to 50 ticks.
Press F3 + B for better observing.
Run /rotate @n[type=minecraft:item_display] 180 0
Observe the blue line patiently.
Repeat all above in 1.21.4
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