Interesting, I think we found a bug: I used the same text as you, the cursor behind the “x” in “exampple”, and this is what I get (Obsidian 0.12.12, Linux):
Right mouse click:

Note: Spelling suggestion and “Add to dictionary” are in the menu.
Context Menu key:

The cursor jumps behind the “h” in “this” and the menu doesn’t have all entries.
**Shift+F10:

Same as with the menu key: The cursor jumps behind the “h” in “this” and the menu doesn’t have all entries.
As far as I know, both the Context Menu key and Shift+F10 should bring up exactly the same context menu as if clicking with the right mouse key.