"Create user records in Keycloak" confirmation dialog appears prematurely

Preconditions:

1. There are users with Keycloak record and without KC record in the system

   1. Users without KC record can be created using POST /users API call

Steps to reproduce:

1. Go to "Settings" → "Authorization roles"

2. Click on the name of any authorization role in the second pane

3. Click in "Assign/Unassign" button on the right side of the "Assigned users" accordion header

4. For several users with and without KC record, do the following:

   1. Fill search input field with the name of a user

   2. Click "Search" button

   3. Select checkbox next to a user row

5. Click on "Save" button in "Select User" modal

Expected result:
"Create user records in Keycloak" dialog is shown and keeps being shown until “Cancel“ or “Confirm“ button in it is clicked.

Actual result:
"Create user records in Keycloak" confirmation dialog appears. Then it disappears for a short time, and reappears again.
(Approximately during this time, user(s) already having KC records are being assigned to a role)

Additional info:

• See examples: