RejectedPart handled by the site are not transmitted to back office for proper error management but instead generate server error.

This leads for exemple to a server error being displayed when submitting a form with a too large file instead of returning the usual error code handled by the client to display an more explicit message.

How to reproduce :
config you site application with a max upload size of 1024o.
upload a file via a form, front editon or whatever
you obtain a server error