The bug
If you have a command that is constantly teleporting you, with a command that constantly checks if you are OnGround:1b after the teleport, the OnGround check will always output as true.
How to reproduce
Repeating command with a constant teleport to X Y Z
Chain command after teleport running
/testfor @p {OnGround:1b}1.13: /execute if entity @p[nbt={OnGround:1b}]Comparator out of chain command
Run system (start the teleport command FIRST then start the
testforcommand) to see that thetestforwill always betrue, even if the teleport puts you in the air. You can check withOnGround:0bto see that the output will always befalse.
Linked issues
is duplicated by 5
MC-257007
Players are sometimes considered OnGround while completely midair after a teleport
Resolved
MC-104519
Armor stand OnGround entity data tag doesn't work
Resolved
MC-135778
NBT Tag "OnGround" sets to 1b after teleporting
Resolved
MC-131753
Teleporting to the air counts as being OnGround?
Resolved
MC-123676
OnGround tag does not update upon teleporting an entity
Resolved
relates to 1
Comments 8
No, in 16w39c, by doing this teleport, you are both not placed on the ground (even though the teleport should technically place you on it) thus slightly above it, yet the testfor outputs OnGround:1b, even though you are NOT on the ground. You can also locate the teleport to high in the air and it will still think you are OnGround:1b. Any set X Y Z teleport is at first determined as OnGround:1b even if in the air.
@unknown, versions older than 1.12.1 cannot be added to affected versions anymore as they're outdated. I suppose you meant 1.12.2-pre2?
Isn't that the opposite of MC-95971?