Relates to MC-259816. Likely same root issue due to no ticking on display entities.

Entities mounted on display entities will not visually update their position until after resyncing. Additional observation: location related selectors target to the visual location of the entity instead of their saved position.

Expected Behavior:

Visual location should sync to the position of the display entity immediately after using /ride

To Reproduce:

1. /summon minecraft:block_display ~ ~ ~ {block_state:{Name:"stone"},Tags:[test]}
   

2. /summon minecraft:armor_stand ~ ~ ~ {Tags:[test2]}
   

3. /ride @e[tag=test2,limit=1] mount @e[tag=test,limit=1]
   

4. Notice the location is not visually updated
5. Leave the world and rejoin
6. Notice the location has now been visually adjusted (See: MC-260000 for separate Y coordinate issue)