Throwing a splash potion towards the foot has the same effect duration as throwing it towards the head

Reproduce(In the video, I used a Potion of Regeneration for 1 minute and 30 seconds):

1.In 24w39a, throws a splash potion at feet

2.In 24w39a, throws a splash potion at head

3.Compare the time and find the same

Expected:

Potions thrown at the feet have less effect time than those thrown at the head