Isn't the tool supposed to create all custom filegroups as part of Pre-Deployment scripts? I would expect this to be the case, judging from the documentation and from ReadyRoll 1.10 change log containing fix for ‘FileGroup does not exist’ errors upon importing tables that are stored on custom filegroups. This is really close to the issue I am facing right now, except the error message is 'Object '[filegroupname]' does not exist'.
Probably worth noting is that my sqlproj file contains FileGroup setting in SyncToOfflineSchemaModelObjectTypes, and SyncOptionIgnoreDataspaces is set to false, yet the filegroup do not show up anywhere in schema-model structure.
Version is 18.104.22.16877