Resolution "snapping"

[dvaeg]

Watched the new 4K UHD of Bridge on the River Kwai last night and there was an unusual video problem I have never seen before. I searched here and on reddit and broadly across the web and have not seen it discussed, so I assume it's something with my setup.

Issue: When there was a fade in/fade out or scene transition, and ONLY during this time, the video mimicked youtube or netflix streaming when the resolution starts low then "snaps" or "jumps" to full res.

See here, as the scene switches to the river. Color and clarity jump instantly.

This did not happen for normal edits, only when there was a scene change. It happened during almost every such change.

Is this a disc issue? Encoding issue? TV/player/cable issue? Any ideas whatsoever?