The /tp command does not seem to affect entities when they have a passenger.

To reproduce:

• Summon any rideable entity (e.g. a boat)
• Set up a command block to teleport or rotate it a small distance every tick, such as the following:

• execute as @e[type=minecraft:boat] at @s run tp @s ~.1 ~ ~ 

• Mount the vehicle.
• Expected behavior: boat continues to move after being mounted.
• Actual behavior: boat stops being teleported while ridden by the player.

We have confirmed this bug in the following cases so far:

• Player riding ravager (using the /ride command, an experiment which resulted in discovering this bug)
• Player riding boat