Issue with Microsoft Teams Add-on in Thunderbird when Using Multiple Exchange Accounts

Hi there, I'm experiencing an issue with the Microsoft Teams add-on in Thunderbird, specifically when using it with multiple Microsoft Exchange accounts. '''Issue Description:''' Previously, I was able to select between accounts using the Teams icon in the toolbar without any problems. However, after switching operating systems, the behavior has changed: * When I hover over the Teams icon in the toolbar, the account selection menu appears as expected. * As soon as I move the mouse to select an account from the menu, the menu disappears immediately before I can click anything. * I've made sure that the mouse doesn't leave the icon or jump erratically, but the menu still vanishes every time. This only started happening after I changed my OS. On my previous setup, the add-on worked fine. '''Fixes Attempted:''' * Removed and re-added the Exchange Accounts * Reinstalled the Owl for Exchange add-on * Fully uninstalled and reinstalled Thunderbird, including manually deleting the profile data folder * Disabled hardware acceleration So far, nothing has resolved the issue, and I haven’t found any other reports of this specific behavior online. The attached image shows the account selection menu when hovering over the teams add-on, but as soon as the mouse moves over to the menu it disappears. '''System and Application Details:''' * Thunderbird Version: 139.0.1 (64-bit) * Operating System: Kubuntu 25.04 * Desktop Environment: KDE Plasma 6.3.4 * Display Manager: X11 * Kernel Version: 6.14.0-15-generic (64-bit) Any suggestions or workarounds would be greatly appreciated.