textures with absolute file path to qrc:/// not loading with delayed loading

All images are stored in resource files.
<file alias="foo/bar.astc">resources/images/foo/bar.astc</file>
texture/diffuse map set in UIP with:
<Add ref="#someref" sourcepath="foo/bar.astc" subpresentation="" />
Same texture is then replaced via code with

presentation->setAttribute(someref, "sourcepath", qrc:///foo/bar.astc).

When using non-delayed loading all the images load and work(?not loaded twice?).

When using delayed loading the images which are being replaced with setAttribute with having differing name (the additional qrc:///) are not found by mapping functions and get drawn white.

This is somewhat a client side problem with mixing conventions with absolute and relative paths. But since it works with non-delayed loading it is confusing for the user.