When creating a thread, if you alternate between the preview buttons, one of the buttons stops working. Not sure if that's as-designed, after I type the "tttt" I attempt to click the white preview button twice with no success.
Thank you for reporting this issue. The issue is now resolved and we are aiming to include that in a future XF release (2.0.12).
Change log:
No longer cache the preview container object in the PreviewClick handler. If there are multiple handlers per page, the cached container becomes incorrect if using different handlers.