Problem 1

Create a user role (type:3) with only the Administration section UI elements enabled. Perform an update of this role by changing the type to 1.

Observe that the user role is updated and no UI elements are enabled:

When such a role is used it causes problems with the Frontend:

PHP Fatal error:  Uncaught TypeError: Return value of CMenuHelper::getFirstMenuItem() must be an instance of CMenuItem, null returned

Problem 2

Steps to reproduce:

1. Create rule with half UI elements visible, half not. Check 'default UI access'.
2. Make rule.update changing only 'default UI access' to 0.
3. Observed: an error message: "At least one UI element must be checked."
4. Expected: successful update. Access to all current UI elements must remain same.

Steps to reproduce:

1. Create rule with half UI elements visible, half not. Uncheck 'default UI access'.
2. Make rule.update changing only 'default UI access' to 1.
3. Observed: successful update. But role now has access to all UI elements.
4. Expected: successful update. Access to all current UI elements must remain same.