Graphic Compositor not able to play two videos at once

As per title, I can’t seem to be able to make two videos play at once in the graphic compositor: not if I put them as individual sub-layers in the same Composition Layer or if I make two individual Composition Layers (one for each).
Both video have alpha channel and they work with no problem at all if I compose one of them over a background static image, but I’ve been wrecking my brain for hours without being able to see both video layers play at the same time.

Any help would be much appreciated.

Do you get any errors? If it happens on the devices, can you check for the logs? On what platform and Unity version are you working with?