Sorry @JMichaelTX, I can't help with your question since I primarily use Safari. If I find a rare incompatibility, I'll try Brave or Firefox, then Chrome.
But your question reminds me of another I had. What's the syntax for said keyboard shortcuts? Entries like Ctr+A show my ignorance.
Also, is there a forum post that describes all of the permitted syntax? I've seen posts discussing specific content (e.g., code entry), but I haven't found a single post that describes the mechanics and syntax for submissions.
I did find Using the Keyboard Maestro Forum on the wiki that includes a section entitled How to Post/Upload Your Macro to the Forum, but I'm still searching information related to the supported extended Markdown syntax (e.g., how to indicate keyboard shortcuts).
Update: Using my browser inspector, I did determine the syntax for keyboard shortcuts, e.g., Ctr+A: