Crossfade not working anymore

Help/How To
1

What is your operating system?
Windows 10 Home

What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?

Shotcut versione 20.11.28

Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)

When moving a clip over the adjacent one it doesn’t make the crossfade transition like in the previous version but simply overlaps the tracks

2

I splitted a video in multiple parts and only some parts seem to be affected by this problem, other work correctly

3

It still works