I just tested also the color scheme Metallic Bottle. Before that, I did that: - I changed in metallic-bottle.conf the brace_good=-value and the brace_bad=-value like the default=-value of metallic-bottle.conf. - I saved the document. I changed to the color scheme Metallic Bottle. I closed Geany. I opened Geany again and checked if Metallic Bottele is the active color scheme.
The issue is also there in some zoom sizes.