mass loader displaying backs as fronts?

Two images for each counter: x.png for front and x-b.png for back.

Using mass loader to load them all, defining Layer (“disrupt”, ^D to activate) and add “ends with -b”. Layer is NOT marked always active.

Mass loader loads them backs fine but units in palette are displayed with backs as fronts i.e. Basic Piece is defined with a correct image but in palette it shows it as if back was “standard side” of the counter.

Any hints?

And for no good reason mass loader adds ^Tab as “decrease layer”.

Picture is worth 1000 words:

When opened, counter is presented as below:

However, it does not display Basic Piece image:

But that from the layer:

I ended up adding pieces directly to buildFile. Seems like Mass Loader is buggy.