I do remember on one of the old Spoiler sites the headline "Colm Meaney Sabotages Deep Space Nine!" I think he was doing a movie and filming went longer than expected.
I watched "A Time to Stand" recently, remembering that, and it looks like they may have filmed around him in some scenes. The opening scene on the Defiant
bridge for example, they never do a wide master shot of the bridge, only closer shots of individual characters.