To be clear, the "fix" resolved part of the issue but not the entire issue.
Previously, if an IP was Whitelisted, then Settings -> Protocols -> SMTP In -> Require Auth Match did not apply. There is not a way to replicate this capability in the current build. With the "fix" you can Bypass SMTP Auth, but some of us want to Require SMTP Auth so we have an account in the header to track and bypass Require Auth Match.
It would seem that several Bypass functions were enabled through the single Whitelist feature and now those functions are being broken out into individual parts.
At Settings -> Security -> Whitelist, there are SMTP, SMTP Auth Bypass, and SMTP Spam Bypass options. My suggestion would be to add an SMTP Auth Match Bypass. This would allow us to still require authentication so we can properly track who is sending messages and allow the From address to be anything, which is quite helpful for Contact Us forms so that we can easily reply to the person who completed the form.