Fractional percentages for image size

I’m trying to manually set image sizes through percentages. If I type 92,6, Glyphs won’t let me enter the value (hitting return does nothing). If I type 92.6, Glyphs ignores the decimal and sets the size to 92%. If I resize the images using the bounding box, Glyphs correctly sets the size with fractional percentages.

On System Preferences, my number separators are set to use commas for decimals and periods for grouping.

Build 1075 on Sierra.