Here is a list of issues that were fixed in this release - build PROD_2021_w31.

Issue Key Description
AVSUPPORT-64154 Some phishing emails were picked by post-delivery but the security event state did not update.
AVSUPPORT-61644, AVSUPPORT-61855, AVSUPPORT-62057 In some cases the flag 'Enable phishing for disabled accounts' was disabled but, but events were still generated.
AVSUPPORT-67271 It was impossible to click on the bars in Shadow IT Graph.
AVSUPPORT-65514 Quarantined Items page default SaaS was set to the email platform.
AVSUPPORT-67212 In some cases, home page custom infobox was not showing all the information the infobox should display.
AVSUPPORT-65569 A few customers experienced some emails not showing up in the portal. Emails were in fact processed, but not showing.
AVSUPPORT-62873 New UI was taking a long time to fully load.