Video fade in/out durations unintuitive

In Shotcut the timecode is HH:MM:SS:FF (FF = Frames)
Frames are dependent upon what Video Mode is used.

A Video Mode using 60fps would go from 00:00:01;00 to 00:00:0;59 going back 1 frame. (FPS = Frames Per Second)

Not a bug.

Your post is similar to this one: