Scoreboard objectives with underscores in the name do not properly parse in command block player selection clauses.

We're using a scoreboard objective to determine if a user should be near a command block. (anti-griefing). When we name the objective "trusted_user", it does not work in the command block player selection clause. e.g. @p[score_trusted_user=1]

If we change the name to "trusted", it works.