Inserting Vanc data for 4K resolution

Hi all, I am using the DeckLink SDK 10.5.2 to insert vanc metadata in the SDI output. Under the directory Examples, there is a VancOutput.cpp file, I ran this example code before writing my own application to see if we can see the vanc metadata in our SDI analyzer. We are using a Sdeye analyzer software with a 2174 PCI card from DekTec. VancOutput.cpp is written for a 1080p format and we can see the metadata in the sdi analyzer. I have made similar changes to another app in the SDK under Linux/Samples/TestPattern to add the vanc matedata to the output test pattern. This app supports different resolutions and output formats. Inserting the vanc metadata works for 1080 and 720 resolutions, but I do not see the vanc metadata for the 4K resolution. Do you know why this is and how to fix it? We are using the 10bit YUV pixel format.

Thanks,
Maneli