Most connectors only support the “bulk” publish type. Some connectors, for example the PROFINET IO Connector, only support timeseries or binarytimeseries.
Not all connectors support all data types. That means, only a subset of the possible features is implemented by a specific connector.
Removing a feature (e.g. removing the support of the bulk publish type and only supporting timeseries format instead) is also considered a non-allowed breaking change, even when both versions comply with the API spec.
Each connector needs to document which subsets are implemented and which API version is implemented. This is important for clients if they did not implement all the features, for example the timeseries publish type.