Affects:

• Content List
• Keyword
• RSS, but there is a different error message: Unable to transform value for property path "[limit]": Expected a numeric.

Steps:

1. Go to Content/Content structure
2. Click Page
3. Go to edit mode
4. Drag and drop a block
5. Click on Settings button

Actual result:

There is an error: AttributeFormMapper for type "multiple" was not found. Did you register and tag the service?

Expected result:

Settings modal appears without an error.