Using @r, @p, @a etc. does not work with the command /scoreboard players reset (@notation)
It looks like it interprets them as a string, rather than replacing them with player names. For example, the command /scoreboard players reset @a outputs "Reset all scores of player @a"
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Duplicate of MC-8277, please use the search function to see if your bug has already been submitted. Currently over 49% of tickets are being closed as duplicate.
Confirmed in 13w04a!