If a command block has the command 'scoreboard teams join Yellow @p[r=1]', and when activated does not find a player within 1 block, a player named '@p[r=1]' is added to team Yellow, instead of simply adding nobody. (Sorry that the r=1 is a link... when you use square brackets it automatically makes it a link)
Comments 5
This is obviously related to MC-8958, but it encompasses all of the @p commands, not just leaving a team.
This is different from MC-8790, which was about the @p function itself not working. That function is now working. This is about modifiers to the @p function not working.