Compare the add time with the broadcast start
Write down when the programme began and when it was added to the library. For example, adding a show at eight-twenty when it started at eight gives a plausible explanation for the missing first twenty minutes. This is a worked timeline, not a measured delay in the service.
Check that you are viewing the intended recording and episode. A similar title, an on-demand version or another broadcast can make the evidence confusing. Keep the channel, date and episode identity with your note so a support question points to one capture rather than an entire series.
Use the playback option that matches the intention
YouTube TV lists choices such as starting from the beginning, resuming and joining live. Starting a partial recording from its beginning means the beginning of the captured portion. The button label does not establish that material from before the library addition has been recovered.
For a match, decide whether you want the captured start or the current live action before selecting the player option. Accidentally joining live can reveal the result or make a saved session appear to skip ahead. Observe the selected mode and timeline before repeatedly changing the library entry.
Check for a rerun or report a different defect
The help says a later rerun can replace a partial episode with a full one. Inspect the actual schedule rather than promising that a full copy will appear at a particular time. If the programme never repeats, the documented replacement condition may not occur.
If the show was already added before broadcast yet the opening is still missing, preserve that distinction and use the player’s recording-report route. Include the programme identity, channel, airing date and missing interval. Do not remove and re-add a series merely to test the idea without first recording the existing state; that change can obscure the timeline needed to assess what happened. The diagnosis should follow the add time and captured material, not assume every late start is the same bug.
Questions about this guide
Does Start from beginning recover an opening missed before I added it?
No such recovery is promised; it can mean the start of the captured portion.
Can a partial recording become complete later?
The help says a rerun can replace it with a full episode.