The problems with Chrome and Found Image have been a recurring issue for some time; at least September 2018 based on a quick forum search. Since I don't use Chrome as my primary browser or many macros with Found Image, the only way I learned about this was by frequenting this forum. Found Image actions can still work with it in the release version of KM, but only by searching in a defined area or the whole screen; front window won't work at all.
And no, while I'm greatly looking forward to KM 9, I'm not actually not beta testing it. I just remember Peter saying somewhere on this forum that 9 will include a workaround for this problem, since it affects so many of KM's users.
For the record, I believe pretty much anyone who wants to beta test KM can (Peter essentialy said as much here: https://forum.keyboardmaestro.com/t/macos-catalina-10-15-pre-release-info/14018/9) but since it's recommended that beta testing be done with an install of macOS that doesn't contain any crucial data, I decided I'd rather wait for the official release.