Check the packet counter register on the deserializer for the data output.
For example, check register 0x40 for the selected type Link A in the MAX96724 camera devices.
Ensure that number of lanes, lane mapping, and routing of the data through video pipes are correct and that there are no errors on the serializer and deserializer.
For display applications, if the sink is expecting a specific timing resolution, check that the source is providing that timing.