I'm a long user of DG's great tools but is the first time I have the need to post in the forums.
I have found this issue from time to time but always used workarounds. Sadly its becoming more and more frequent.
Some discs present a test screen prior to the movie itself for around 1m30s. The test screen like shown below (and in this case theres also some extra footage in the end) is present on the m2ts but playlist starts and stops where it should.

The test screen have a loud beep while it lasts.
The issue is that while playlist reports the correct runtime (1h45m in this disc case) DGDemux always demuxes the "full" m2ts file (2h00 in this disc case). Meaning that both the test screen and the extra footage in the end are included and I have to cut them out.
Is there a way do make DGDemux "respect" the playlist or maybe I'm doing something wrong?
Sorry for my messy explanation!