ride command incorrect in loop

execute command
/summon pig ~ ~ ~

{Tags:["ride"]}

put command in repeating command block
/ride @p mount @e[tag=ride,limit=1]
Dismount pig
Move around
execute command
/data get entity @s Pos
compare pos from f3 and from command
press shift to tp pig

Result
server side - player riding on pig
client side - player can move and do any