thanks for the detailed answer; but...
1. How can I reproduce the issue that is relevant with canonical URL placing on every page by Rank Math SEO while in Troubleshooting Mode every plug-in and theme disabled?
2. then when I activated only Rank Math plug-in in TS Mode and execute SEO Analysis; there was still a warning that says: "No canonical link tag found on your page."
3. additionally in TS Mode, Ad-Sense theme(the theme I use) activation is impossible, so I think; because cannot be clicked on it in TS menu at the top of the WP screen
so, I confused....