Whatever on-set drama there is, it doesn’t seem to have anything to do with the earlier premiere of the final season either. Instead, it appears the popular series was just moved up to replace Sunnyside, which NBC pulled from the air after four episodes. The Kal Penn-led sitcom was moved to online only while the more popular Will and Grace is more certain to bring in the ratings the network needs for such a primetime slot.
Will and Grace airs Thursdays at 9:30 p.m. ET on NBC.
Source : https://www.distractify.com/p/debra-messing-megan-mullally-feud