Ensure that Entity display name changes to custom Activity entities are propagated fully to the global optionset used by the Activity Type filter seen above activity views. This will greatly improve the filtering experience where custom activities have been used & renamed.

If you change the name of a custom activity, the field "activity type" does not get updated type names. leading to a situation where users will not be able to filter views successfully because the type names shown in the view records will not reflect the filter options. This seems to be held in a global optionset. Values in this optionset seem only to be set when the custom acitivity entity is created but are not updated if the entity name is changed.

this option set it not editable to admins - changing that for the labels would be one way to enable this / fix this.

option set : Activity Type / activitypointer_activitytypecode