It may depend of several factors, so, can you please provide a simple demo via attaching zipped project here or sending it to our support e-mail (https://lmd.de/mfs).
We've added transparency support for button glyphs in one of recent versions. Your image is a fully transparent 32-bit bitmap. Alpha channel is zero in every pixel.
You can either convert it to 24 bit bitmap or create an image with usefull alpha channel. I've attached converted images.
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