Chrome Beta is officially not supported at this time. The Chrome version that is started by the adapter is going to be the one configured as the main version in the registry. The specific registry setting that we check is: "SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe". We first check HKLM and if not there check CurrentUser.
Using automation with two versions of Chrome is also not supported at this time. The reason being is that Pega Robotic Automation only works with one messaginghost version. When starting Chrome Beta and Chrome GA, two versions of messaginghost are started, one for each Chrome main process. We would only work with the first Chrome instance or messaginghost that was started.