Command:

/execute as @s at @n[type=pig] run teleport ~ ~ ~

Expected behaviour:

The entity running the command would teleport to the nearest pig.

Actual behaviour:

The entity is teleported to its own relative coordinates.

Other notes:

• This seems to apply to both teleport and tp commands.
• The behaviour is the same when attempting to use execute positioned, regardless of if the position is another entity or a constant value. (edit: if the positioned value is set to a specific coordinate, it will print in chat the correct coordinates)
• This bug prevents being able to teleport to an entity, and keeping the original rotation.