MRQ renders proxies instead of high-res Media Plate footage

Hello folks,

in our project we work with several 4K image sequences as part of our scene (EXRs). As such, I’ve created lower res proxy sequences for better in-editor performance (PNGs). They are recognised correctly and show up in the viewport, however during rendering UE does not automatically switch to the high-res versions.

How can I make it use the high-res EXRs instead?