This redirects are ignored because of the IAM redirect pattern.
Relevant code. 
validator.go:16 invalidRedirectRegex = regexp.MustCompile(`^[/\\](?:[\s\v]*|\.{1,2})[/\\]`)

%68%74%74%70%3a%2f%2f%67%6f%6f%67%6c%65%2e%63%6f%6d
/<>//example.com
/?url=//example.com&next=//example.com&redirect=//example.com&redir=//example.com&rurl=//example.com&redirect_uri=//example.com
/?url=/\/example.com&next=/\/example.com&redirect=/\/example.com&redirect_uri=/\/example.com
/?url=Https://example.com&next=Https://example.com&redirect=Https://example.com&redir=Https://example.com&rurl=Https://example.com&redirect_uri=Https://example.com
/%68%74%74%70%3a%2f%2f%67%6f%6f%67%6c%65%2e%63%6f%6d
/ReceiveAutoRedirect/false?desiredLocationUrl=http://xssposed.org
/http://%67%6f%6f%67%6c%65%2e%63%6f%6d
/http://example.com
/http://google.com
/http://localdomain.pw
/https:/%5cexample.com/
/https:/%5cgoogle.com/
/https:/%5clocaldomain.pw/
/https://%09/example.com
/https://%5cexample.com
/https://%5cexample.com@google.com
/https://%5cgoogle.com
/https://%5clocaldomain.pw
/https://%5cwww.whitelisteddomain.tld@google.com
/https://%5cwww.whitelisteddomain.tld@localdomain.pw
/https:///example.com/%2e%2e
/https:///example.com/%2f%2e%2e
/https:///example.com@google.com/%2f%2e%2e
/https:///google.com/%2f%2e%2e
/https:///localdomain.pw/%2f%2e%2e
/https:///www.google.com/%2f%2e%2e
/https:///www.whitelisteddomain.tld@localdomain.pw/%2f%2e%2e
/https:///www.whitelisteddomain.tld@www.google.com/%2f%2e%2e
/https://example.com
/https://example.com/
/https://example.com/%2e%2e
/https://example.com/%2e%2e%2f
/https://example.com/%2f%2e%2e
/https://example.com/%2f..
/https://example.com//
/https://example.com@google.com/
/https://example.com@google.com/%2e%2e
/https://example.com@google.com/%2f%2e%2e
/https://example.com@google.com/%2f..
/https://google.com/
/https://google.com/%2e%2e
/https://google.com/%2f%2e%2e
/https://google.com/%2f..
/https://localdomain.pw/
/https://localdomain.pw/%2e%2e
/https://localdomain.pw/%2f%2e%2e
/https://localdomain.pw/%2f..
/https://www.google.com/%2e%2e
/https://www.google.com/%2f%2e%2e
/https://www.whitelisteddomain.tld@google.com/
/https://www.whitelisteddomain.tld@google.com/%2f..
/https://www.whitelisteddomain.tld@localdomain.pw/
/https://www.whitelisteddomain.tld@localdomain.pw/%2e%2e
/https://www.whitelisteddomain.tld@localdomain.pw/%2f%2e%2e
/https://www.whitelisteddomain.tld@localdomain.pw/%2f..
/https://www.whitelisteddomain.tld@www.google.com/%2e%2e
/https://www.whitelisteddomain.tld@www.google.com/%2f%2e%2e
/example.com/%2f%2e%2e
/google.com/%2f%2e%2e
/localdomain.pw/%2f%2e%2e
/redirect?url=//example.com&next=//example.com&redirect=//example.com&redir=//example.com&rurl=//example.com&redirect_uri=//example.com
/redirect?url=/\/example.com&next=/\/example.com&redirect=/\/example.com&redir=/\/example.com&rurl=/\/example.com&redirect_uri=/\/example.com
/redirect?url=Https://example.com&next=Https://example.com&redirect=Https://example.com&redir=Https://example.com&rurl=Https://example.com&redirect_uri=Https://example.com
/x:1/:///%01javascript:alert(document.cookie)/