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You do not create anything in these two triggers, so no, it does not leak. It also does not desync unless you read the AlphaReal variable elsewhere before resetting it. The fade filter is done for everyone, only that it is completely transparent to others. The deactivation of health bars and tooltips is part of the disablement of the user interface this Fade Filter action contains. You may use the Advanced Filter or activate it again via call EnableUserUI(true)
(use Custom Script action to implement jass lines in GUI triggers).