Hello Benn,
I just posted in the forum thread you referenced but thought I should also respond here for completeness.
I've already applied a fix which will be available with our next internal build on Monday (09.11) if it successfully passes our testing process. Please let us know once you manage to test it out.
Regards,
Dilyan Traykov
Progress Telerik
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A fix to the property grid in 2020.Q1.115 causes this issue again. See last posts at:
https://www.telerik.com/forums/performance-degrades-while-the-property-grid-is-placed-in-raddocking