Content Page - Non-instanceable Widgets become Instanceable after deleting it

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.4.3.18 CE GA18, 7.4.3.19 CE GA19, Master
• Component/s: Pages > Content Pages
• Labels:
  • ee-ts
  • liferay-ga5-ce-743
  • liferay-ga6-ce-743
  • liferay-u1-dxp-7413
  • liferay-u2-dxp-7413
  • liferay-update-dxp-18-7413
• Fix Priority: 2
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/7572

Step-by-Step (Use the video):

1. Create a blank Content Page
2. Edit Content Page and add non-instanceable widget (Blogs)
3. Delete the widget
4. Add the widget back
5. Add the widget again

Actual result:

The widget is instanciated twice.

Expected:

The widget is disabled to add onto the page.

Evidence:
ContentPage_canAddNonInstanceableWidgetAfterDeletingWidget.mp4