Keeping things simple is key to making SVGs that are optimised and ready to animate. Tools like Adobe Illustrator convert bitmap images to vectors, but the output often contains too many extraneous groups, layers, and masks. Instead, I start cleaning in Sketch, work from a reference image, and use the Pen tool to create paths.
If you have a national domain .pl (we checked .com and .net - the error doesn't occur there), create a subdomain with a name consisting of EXACTLY 5 characters (e.g., test1.jakubsawa.pl), add it to GSC (either as a property or domain), and add a link to sitemap.xml. GSC WON'T FETCH IT!