from overlay mode to off screen when ff ,Rw in timeshift

[faam]

Hi
I do not know if it it a bug or not, after forwarding or rewinding in timeshift and after resetting Directshow
clearly happened when i use VMR with elecard or mainconcept
or Nvidia Purevideo.
Rarely happened when I use Dscaler or FFdshow
As we knew that VMR using overlay surface when it can but i see it changed to off-screen suface which is odd with these decoders
Any help or explanation
Note :
Logging is disabled , Graph is attached to ROT, DD v1.4d, SimOSD, vpl**

Regards