I only watched the first quarter and a half of MIL/TOR but it reminded me of jeff van gundy talking about "making multiple efforts" on defense. Bucks only make one effort.
i.e.
In the paint: Opps beat the first line of defense. Lopez comes over to help. No one rotates to Lopez's man, Lopez's man gets a dunk.
On the perimeter: Double comes, ball kicks out to the helper's man, 2nd helper barely rotates on time, ball swings to the 2nd helper's man, everyone gives up and watches the wide open 3.
This happened a lot with Dame in the 1st qtr but it was happening in the 2nd quarter when it was Giannis and the 2nd unit on the floor. Just very unprepared/going through the motions basketball.