+### CiviMail
+
+- **Exception Malformed temp table category on New A/B Test
+ ([dev/core#1564](https://lab.civicrm.org/dev/core/issues/1564):
+ [16464](https://github.com/civicrm/civicrm-core/pull/16464))**
+
+ Fixes a regression in 5.21.2 where creating a new A/B Test resulted in a
+ session status Exception Malformed temp table.
+