The "resume from" option never gives me the right timestamp

Background: Jellyfin app on a Roku Ultra, all codecs and episode lengths are affected

Not a significant issue by any means but it happens every time and I don't know why.

Sunday night I watched Episode 9 of a show then went to bed. Last night, I scrolled to Next Up and selected episode 10. Jellyfin then asked me if I wanted to start at the beginning or resume from 12:42. I THINK the time it gives us 50% through a show (I've gotten used to ignoring it)

I have no other players to test but I did confirm it happens on all file types and run times. I did NOT test if it's accurate when I do stop an episode half way, through.

Is this a Roku-exclusive problem? Is there a solution either way?