I have enabled email-to-case functionality and I have a user with Partner Community license. He works on Partner Portal. When he opens an e-mail through the Partner Portal its status is not updated to "Read" (It is still in "New" status). However if Salesforce user opens the e-mail, the status is automatically updated to "Read".
Has anyone spotted similar issue? Are there any special permissions which need to be enabled for Partner Community user to invoke changing EmailMessage status?
EDIT: This issue occurs only for third party e-mails.