Created attachment 185171 [details]
Most strange fps indication

SUMMARY

I encountered some unbelievable timing indications, including the 'thermometer' moving forth and back. To my surprise, the rendered output is spotlessly correct and play okay.

STEPS TO REPRODUCE
1. Render a specific video source

OBSERVED RESULT
Ridiculous indications, including negative fps, show

EXPECTED RESULT
Correct indication of timing

SOFTWARE/OS VERSIONS
Fedora 42

ADDITIONAL INFORMATION
Having rendered thousands of movies with kdenlive, I've never seen this before. 
Again, it seems to have to make with timing, somewhat similar to e.g. #509101, where the bug also sets in immediately after some timing operation.