Breaking: #75747 - EXT:form - Removed useDefaultContentObject setting 

See forge#75747

Description 

The TypoScript option useDefaultContentObject of the FORM cObject has been removed. Setting this value to 0 allowed the usage of the prehistoric content type mailform.

Impact 

It is not possible to configure the rendering of the FORM cOject. The setting is not evaluated anymore.

Affected Installations 

Any installation that uses the TypoScript option useDefaultContentObject = 0.

Migration 

Remove the TypoScript option from any TypoScript settings. Migrate manually to use the features of EXT:form.