If do you clic on GOOLE word in map modul, Google Map is open in external browser, this is OK, but if do you presse on shift + clic, Google map is opened in the LR windows and no possibility to close that, I do closed the LR windows !!!
Version 9.3, an update to Lightroom Classic, went live on June 15, 2020 and contains a fix for this issue. Please install the update and respond back if it does not cure the issue for you. Thank you for your patience!