[Seaside] 'Allow debugging of errors' does not work for rendering? Only for callbacks?

[James Foster]

Is there a way to configure Seaside so that an error during rendering will be reported to the client browser with a walkback (as we had in Seaside 2.8)? 

I am using the Seaside 3.0.3 One-Click Experience Pharo download and on the Configure page from the Welcome page I've checked the 'Allow debugging of errors' checkbox. When I have an error during a callback, the error is reported properly. When I have an error during rendering, a walkback happens in Smalltalk with the error that a call is not allowed here.

renderContentOn: html

	html headingg: model.	"this error does not behave the way I want"
	html anchor 
		callback: [self foo];	"this error is presented in the web browser as a walkback"
		with: 'click me!'

James