Thanks @the Core
Yes, it does seem Chrome 77 beta is working, based on earlier eBay user observations.
However, my posts are mostly to confirm if a fix was part of a known issue and patch to avoid a future regression if this issue is inadvertently sneaking in and out of the code base.
Attached is a screenshot from Incognito mode. I had to set the zoom to 150% to get this, but that's mainly because I updated this eBay listing to work around the issue for lower zoom levels.
The core of the issue seems to be iframe height of 4097 or more, whether that's an absolute >= 4097 or a relative height based on a zoom level over 100%.
Version 76.0.3809.100 (Official Build) (64-bit)
Ubuntu 18.04.3 LTS