Start with the change in the download list
If a finished episode disappears and the following episode appears, that observation is different from finding an unfamiliar film saved on the phone. Do not assume that either change was made by another person. Netflix has two automatic download features, so the sequence and identity of the new item provide useful clues before you delete prepared travel viewing.
Identify the relevant automatic feature
Download Next Episode removes a watched downloaded episode and fetches its successor; Netflix says the final episode is not automatically removed. Downloads for You instead selects recommendations, with a storage allowance adjustable for each profile. Both are optional Smart Downloads features for current supported mobile apps, require Wi-Fi for their automatic work, and are excluded from ad-supported plans.
Apply that distinction to an actual trip
Suppose episode three has replaced episode two overnight. Review Download Next Episode if you intended to keep the watched episode for a second viewer. If an unrelated documentary occupies space, review Downloads for You and the profile allowance. These observations call for different controls even though both items appear in the same Downloads area. Avoid deleting every download before determining which behaviour you want to stop.
Check the list you will actually rely on
Open the prepared list before leaving connectivity and confirm the episode order yourself. An enabled automatic feature does not establish that a later episode exists or has finished downloading. If using a deliberately chosen itinerary, switch off the automation that conflicts with that itinerary and verify the retained items afterwards. A watchlist remains a planning aid rather than evidence that its contents are stored locally.
Questions, answered
Will the final episode automatically disappear after watching?
Netflix explicitly excludes the last episode from automatic deletion by Download Next Episode.