When using Bosch plugins inside Milestone XProtect, you might run into issues with the Metadata stream.
Due to a bug in the Milestone Driver (up to device pack 12.7) the Bosch binary metadata stream is incompletely stored.
An easy workaround in this scenario is to change the Metadata streaming mode in XProtect from Bosch binary to 'Bosch binary & Onvif'. This can be set in the Metadata settings in the Milestone Management Client. A final fix needs to come from Milestone with a Device Pack update.