[BUG] Scrubbing in Safari before playback doesn't work intermittently

[elynema]

Describe the bug
If the user selects a new section and quickly scrubs someplace fairly late in the video before beginning playback, the playhead will jump back to the beginning of the video.

If the user sits for a few seconds before scrubbing after selecting the section, the scrubbing works. Likely due to the video not being fully loaded.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://avalon-dev.dlib.indiana.edu/media_objects/fq977t794
2. select second section
3. Quickly click on progress bar to scrub to somewhere past the middle of the video.
4. Wait. You’ll see the playhead jump back before starting playback.

Expected behavior
Scrubbing should work even before video is fully loaded into the player.

Screenshots
Private Zenhub Video

Desktop (please complete the following information):

• OS: iOS
• Browser: Safari

[Dananji]

We are intentionally calling player.load() upon page load for Safari because the player doesn't fully load automatically like in other browsers. This helps us to use scrubbing/seeking on the player progress-bar or use structured navigation and playlist markers to scrub/seek before playback starts.
This is causing the player to reset on Safari, if the user scrubs/seeks within the window where, the player is revealed and player.load() is called.