"Fix to maintain resume playback position within the ‘extended’ portion of extended recordings"
I still think this fix may fail in some cases.
Here is the example: Where I live the British Open golf was scheduled to record from 4AM to 11AM with the extended recording option true. As it turns out the extend time caused the recording to continue to 1PM.
I was watching at 3 hours and 42 minutes into the recording when I stopped watching at what seemed like exactly 1PM to leave the house to run some errands.
Later in the evening I could only start watching at the beginning. Did the resume fail due to stopping at 1PM or due to being in thumbnail generation.
But since I've seen this bug for so long my brain is trained to memorize the viewing stop times for long sports events just so I can recover to the resume point.