OnePlus hasn't pushed the sources for the latest Android 11 beta, and for the stable builds 10.3.6 and 10.3.7. OnePlus is well aware that not submitting the modified code in a timely manner is a GPL violation.
Edit: OnePlus needs to submit sources from the latest beta 2 and the stable build 10.3.8. as well. It's been months and no answer as to why they've delayed that.
Edit 2: I've been in contact with the FreeSoftwareFoundation. Hopefully they'll investigate and see what can be done about this issue
Edit 3: OnePlus says no changes have been made since 10.3.5. I very much doubt that.
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If changes have, indeed, been made, OnePlus is now refusing to submitting their sources, even when asked.