Fade In/Out Won't Stick

I’m working on a series of scenes upon which I want to use the fadein/out filters. In Shotcut, the scene looks right as I preview my edit with the filters. But when I export the clip. There is no fade in, the clip fades out in the middle of the clip, and the clip resumes.

What newb thing am I doing wrong?

Not sure if this was the right way to fix the situation, but I worked around it by cutting and exporting the raw footage first as individual clips. Then I applied the fade in/out to those clips and exported as finished clips.

Something like this . . .

3-minute raw footage > 3 1-minute clips > 3 1-minute clips with filters applied.