Configuration as in screenshot - for issue types Bug & New Feature I have a screen different than default (less fields). In Quick Create when I change issue types for this project the fields get updated accordingly (with the option 'All' fields set). Changing issue type in Quick Edit does not update the fields according to the associated screen.

One of the ways in which this can be quite problematic is when changing a tasks issue type to epic in JIRA Agile via the edit screen. In the default create/edit screen for epics an Epic Name is required, but this bug allows you to actually edit an issue, change it's type to an epic, without providing an epic name. Consequently this creates an unlabelled epic