Bohemian Coding has done amazing work on Sketch over the years, the one area I still think needs more work is Text on Path. It has some odd redraw issues that Booleans had with Boolean Operations, especially with Difference. Using the vector tool (shortcut: V) is less buggy than using an Oval Shape -> Scissor tool -> Delete Paths (to make the same outline you have). This method has some redraw issues and you need to flip the shape horizontally using that method for Text on Path. Exporting that asset won’t show the redraw issues but very annoying.
BTW nice tips article!