Frozen first frames with MTS files

Hi,

I’ve been using Shotcut with some MTS files from my camera.
After some work cuting some fragments from my clips, placing them on the timeline, and rendering the result. I’ve noticed that the first frames of all my clips are frozen. If I try to cut those frames, it still shows frozen frames. This happens also previewing.

I’ve also the same problem on kdenlive, so it could be MTS related.

Here is a guy with the same problem
https://old.kdenlive.org/forum/problem-sticking-mts-files-together

I seems that shotcut is unable to access those frames if they’re not keyframes or something like

Is there any way to solve this problem without transcoding?

Thanks.