When editing Web (Undertow) Global Settings form, the values do not update on page after saving the form.

Reproducer:

When I go to http://localhost:9990/console/index.html#undertow
(Configuration⇒Subsystems - Subsystem⇒Web Settings⇒Global Settings - View)
And I click "Edit"
And I change "Default Servlet Container" from "default" to "foo bar"
And I click "Save"
Then no  alert is shown
And the value is still showing "default"
Then when I click "Edit"
Then the value in "Default Servlet Container" shows "foo bar"

Expected behaviour:
After saving the form, either success or error is shown

Note:
This is true for more fields in this form - I've used "Default Servlet Container" as an example.