Did you try enabling DXGL in ZCL, and did this affect the ZQ Editor component?
I purged all on my non-tablet W0 stuff and run exclusively 7, because I quickly tired of MSBS. As such, this is very hard, if not impossible to test against, and my tablets have horrible integrated gfx chipsets tat won't align.
It is possible that DirectX was affected in those updates on your specific hardware.
Looks like KB4530684 Cumulative Update for Windows 10 1909 mucks wit DirectX. Report this as a bu to MS please.