Yup, can happen with crappy mp4 or H264 files.
They are looking into it.
But I can’t stress enough that only a few codecs are good enough to work with video.
(And that goes for ALL DAW’s)
Dndx
ProRes
Photo Jpeg.
Any other codec can -and probably will- cause you troubles. Both in performance and accuracy.
So, convert your video first and then import audio.
Fredo