Splash potions when thrown while a player is within 1 block in any direction, affect both players, but not the mobs or objects that they are thrown at. In my case, I tested this bug with speed, regen, instant regen, instant damage, strength, fire res, night vision, and water breathing. There is an attached video example using instant damage.
Note: The player's hitboxes were not touching in the testing.
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There actually is no video attachment.

Here you go... it didn't attach for some reason: http://www.mediafire.com/download/6jhbs9i5zzjqdu3/Bug.mp4

I can see the attachment fine

Does MC-88491 describe your issue?

@redstonehelper Sort of... my problem is with 2 players standing next to each other. When one throws a splash potion, it lands about 2 blocks away on some kind of invisible barrier. In that one, projectiles from a mob are hitting the player while in my case, the potions are hitting an invisible barrier, causing them to effect the players.

Is this still an issue in the most recent versions (currently that is 1.12) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.

Is this still an issue in the most recent versions (currently that is 1.12.2, or the latest 1.13 pre-release 1.13-pre3) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.