This one has been around forever, but I always figured it would be fixed at some point and never reported it.
Easily replicated:
Create a rich text widget, add some text.
On the canvas element, highlight some text and hit the B button to bold it - it creates a < b > tag on the text
Use the panel on the left, highlight some text and hit the B button to bold it - it creates a < strong > tag
I got the entire post completely wrong as I started it, got a phone call, then continued lol
The actual issue is the bold formatting button, not the shortcut. If you use the B button when highlighting text in the bricks canvas it inserts < b > if you do it in the editor on the left panel, it inserts < strong >