Please elaborate on your answer. What does have GPU manufacturer in common with ability of CCG to copy rendered data to decklink?
Or was your answer related to OpenGL errors in the old CCG versions? Seems fixed in the current CCG releases, but other problems introduced, making trouble with the decklink.
What other means or tools can I use for debugging the issue deeper? Would for example WPA (Windows Performance Analyzer) help finding the issue?
//EDIT: Have searched the forum and found out numerous people run CCG on intel integrated GPU. There are even mentions of this very exact intel UHD 630 GPU, and not causing issues. I hence think your answer is invalid and the GPU is not a problem.
See for example thread here (forum user hreinnbeck Leader: using the CCG on even older Intel HD 4600, or used balte running this very exact UHD630 with 2 Fill+Key outputs: Onboard GPU - #6 by hreinnbeck
Or here is mentioned exactly the UHD630 should be working just fine: Intel NUC 9 Extreme
So I may probably report this as a CCG bug?