It appears update 8.1.7 had some perspective URL changes. This seems to have broken logging in with an IdP when brackets are included in the target path. Is this a known issue?
My targets have been converted using the urllib.quote_plus() function but the page.props.path parameter contains brackets instead of the ascii code %5B and %5D.
If I replace the brackets with %5B and %5D in the URL the login works fine.