Email Connector Error v.4.0.0 HTML Preview (Rich text) not working

hi community, I need your help.   I use the Email Connector to send mails from my Mx App. Version 4.0.0 was released on 12 April 2023. When I want to create templates, I can't see the HTML (preview). The widget is not displayed (see screenshots). e.g.: SNIP_EmailTemplateNewEdit (Tab 2).   I have updated from v.3.0.1 to v.4.0.0. Everything worked before. After the update not anymore.   I suspected that maybe something went wrong with the Module replace, so I created a new project and directly integrated the v.4.0.0. I do not see this there either.    Does anyone know what the problem is? Thank you and best regards  
1 answers

Alternatively, it is possible to use the CKeditor widget as a workaround. Someone should start a support ticket to let Mendix know that the 4.0.0 version of Email Connector has a bug…