The application started to slow down very much (when using images on Buttons)

Hello again, I decided to change the textures a bit, but a new problem appeared when compressing them. For some reason, instead of a gray background for highlighting, the background turned black. Because of this, the outline around the image also becomes transparent. Tell me what to do.
I tried disabling the plugin, but the window still appears. I've already tried different settings. Either the outline becomes transparent, or the transparency is not preserved. I even tried to install a chromakey background on the images, but this option also turned out to be a loser because there are remnants of the chromakey background around the outline.

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