| **Change the database schema?** | **yes** |
| **Alter the API?** | **yes** |
| Require attention to configuration options? | no |
-| Fix problems installing or upgrading to a previous version? | no |
+| **Fix problems installing or upgrading to a previous version?** | **yes** |
| **Introduce features?** | **yes** |
| **Fix bugs?** | **yes** |
Ensures the Mailing List group type remains set on the Update Smart Group
form.
+- **loadServices: tighten up file match regex
+ ([16377](https://github.com/civicrm/civicrm-core/pull/16377))**
+
+ Ensures that CiviCRM code living under a path containing the characters 'php'
+ does not crash when loading services.
+
- **Activity type listing shows name instead label
([dev/core#1470](https://lab.civicrm.org/dev/core/issues/1470):
[16094](https://github.com/civicrm/civicrm-core/pull/16094))**
([dev/core#1474](https://lab.civicrm.org/dev/core/issues/1474):
[16101](https://github.com/civicrm/civicrm-core/pull/16101))**
+- **Undefined offset and uninitialized string offset notices on upgrade to 5.21
+ ([dev/core#1555](https://lab.civicrm.org/dev/core/issues/1555):
+ [16417](https://github.com/civicrm/civicrm-core/pull/16417))**
+
### CiviCase
- **Add case activity action links to activity report
displayed instead of the standard activity actions (eg. move/copy to case
instead of file on case).
+- **Activity Details CiviReport gives network error when paging to next page if
+ choose filter to include case activities
+ ([dev/core#1552](https://lab.civicrm.org/dev/core/issues/1552):
+ [16393](https://github.com/civicrm/civicrm-core/pull/16393))**
+
- **Case Detail 'Active Role?' filter excludes cases without relationships
([dev/report#24](https://lab.civicrm.org/dev/report/issues/24):
[15972](https://github.com/civicrm/civicrm-core/pull/15972))**
Ensures that the actions menu on the participant search form respects search
criteria.
+### 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.
+
### CiviMember
- **Fix js error on choosing membership type
- **[Ref] Remove php4 support from BAO_Acl class
([16119](https://github.com/civicrm/civicrm-core/pull/16119))**
+- **(NFC) Civi, CRM, tests - Update for
+ Drupal.Commenting.VariableComment.IncorrectVarType
+ ([16384](https://github.com/civicrm/civicrm-core/pull/16384))**
+
- **[NFC] Test clean up.
([16133](https://github.com/civicrm/civicrm-core/pull/16133))**