Minecraft-Java-Edition-Minecraft-Commands – How to Detect the Dimension Where a Player Is in Minecraft

This is almost a version of @MrLemon's answer. Run the following command once:

/scoreboard objectives add Dimension dummy

Put the following commands on a fill/fast clock:

/scoreboard players set @a Dimension -2 {Dimension:-2}
/scoreboard players set @a Dimension -1 {Dimension:-1}
/scoreboard players set @a Dimension 0 {Dimension:0}    

Then do the tp as following:

/tp @a[score_tpHome_min=1,score_Dimension_min=0] 68 68 68

How this works is it gets the player dimension by setting the scoreboard objective Dimension to the dimension that they are in.

While c=1 does create a sender bias, it also has the potential to create a "player" bias, which will attempt to target players first before targeting non-player entities. A player bias is dependent on the command/feature. The only cases where a player bias occurs is with /scoreboard commands (not counting /scoreboard teams join ... or /scoreboard players tag ...) and stored CommandStats.

The solution is to prevent targeting players, such as either with the type=!Player parameter:

/execute @e[name=setter] ~ ~ ~ scoreboard players operation @e[name=getter] test = @e[type=!Player,c=1] test

Or targeting the specific type of entity with @e[type=ArmorStand]:

/execute @e[name=setter] ~ ~ ~ scoreboard players operation @e[name=getter] test = @e[type=ArmorStand,c=1] test