When trying to execute the command (/data merge entity @e[type=arrow] {NoGravity:1b,Glowing:1b,life:5.0,crit:1b}), it doesn't work. It says "Only one entity is allowed, but the provided selector allows more than one at position 0: <–[HERE]. Can you fix it? (or maybe I'm trying to do something wrong)
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See MC-121807, you are only allowed to modify the entity.
Use this command instead:
/data merge entity @e[type=arrow,limit=1] {NoGravity:1b,Glowing:1b,life:5.0,crit:1b}
You can only select one entity in data command, if you want change multi entities' nbt tag,please use command:
/execute as @e[type=arrow] run data merge @s {NBT}