Redirect migration wizard creates wrong redirects
When updating from TYPO3 8 to 9 and when having domain records with redirects for example for redirecting a subdomain without www to the one with www, the update migration wizard 'Install system extension "redirects" if a sys_domain entry with redirectTo is necessary' creates wrong redirects.
For example if you had a domain record in 8 for domain "test.com" having the redirect target "https://www.test.com/", the migration wizard creates a redirect with an empty source domain and the source path "/test.com/", which is not correct. It should have been source domain "test.com" and source path "/". When correcting this manually after the upgrade wizard, it works fine.