Maps was updated in the store to support nc28 and nc29 
full SSL is more secure in theory but in turn adds many headaches - especially when security people at some point decide to “make you system more secure” custom things like self-signed certificates are first to brake e.g. because the reverse proxy doesn’t trust you CA anymore etc… if you host reverse proxy and application on the same host attack surface from missing tls is almost zero…
you have to follow different procedures for reverseproxy with or without SSL termination e.g.
you can keep your SSL setup running as long you are confident the issue does not result from there (use checks from the guide). your CODE problem will not go away itself. Proceed with troubleshooting according to Collabora integration guide.