Yeah. I think this is a known bug. Most likely if you dont move the trimmer or try and trim the whole clip messes up the FFMPEG command.
Hasnt effected paying users yet, so it's lower priority, but will be addressed soon.
I am thinking about improving that UX. Instead of immediately prompting the user to trim. This will be in the toolbar as a "tool". So if you want to trim a podcast episode you can, that is the main use case, so it might make the most sense this way.
I slapped this in quickly because I was targeted podcasters for the first few customers and this was a critical tool to have.