Maybe i misread but shift+T will bring you back to the original sequence.
As i read it the cuts are in seq 1 which is nested in seq2. TS edits in seq2 and wants to jump to cuts in seq1. But one cannot see the cuts from seq1 in seq2.
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Adobe Certified Expert Premiere Pro
If you want to know the codec you can use MediaInfo. https://mediainfo.sourceforge.net/nl
If you do not know which setting to choose drag the clip from the project bin into the new item icon. This will create a timeline with the same settings as the clip.
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Adobe Certified Expert Premiere Pro