Lawrence, thanks for the PR. We appreciate any insights from you all. We ahve already started to build using the first seed of Big Sur and have already committed some fixes. Rather than having multiple open issues covering the same topic, I'd like to suggest that we use the existing one Issue41100 to consolidate the PRs; to that end, I've changed the title of your PR (PR 21224) to reference that issue and I'm going to close this one. I'll add you to the other issue and we can continue discussions. BTW, I believe a DTK is in Ronald's future :)