[opensuse-factory] Ctrl-N no longer works after upgrade to KMail5

I just successfully migrated my data to KMail5 and so far it feels more responsive than KMail4. Thanks for the work put into it! However, there is one glaring bug that has popped up. Pressing Ctrl+N results in the following error message: "The key sequence 'Ctrl+N' is ambiguous. Use 'Configure Shortcuts' from the 'Settings' menu to solve the ambiguity. No action will be triggered." I have checked the keyboard shortcuts and it is mapped to the default action for a new message. How do I fix this error?