render cache does'nt work with timeline 1080 * 1350

Hi the render cache doesn't work with timeline of resolution 1080 * 1350. I use a timeline in another timeline.

it render a little part becoming blue, and come back red again, go on the left blue and become red again,

It is with dnxhd lb and if you try with gopro cineform 10 it crash the application immediatly.

DNxHD codecs do not like non standard frame dimensions.

same problem with this timelinne in uhd, it's not the resolution, it's the fact to put a timeline in another timeline. and if i let cache the first timeline, the second with the first in it become blue ...