When Snapshot Pro or Hustle is active, I see 500 Internal Server errors in the browser console, or, sometimes, even on the frontend of the site.
And I see the following error in server error log
H00124: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer https://al***y.com/en/contact/
When one of this plugins is active = error, when they both are deactivated, there are no errors.