So perhaps give an explanation for what precisely you're doing, whether you are trying a binary or supply install? Without info as you can read, "the same problem" is nearly simply not the identical hassle. Please offer a entire log with every command you type and the whole output. You can upload them as attachments right here.
Are those fields included into the CalDac Synchronizers mechanism and nextcloud isn't able to store them? Or are they allready ignored by using CalDav website Synchronizer?