When using an external monitor with iPadOS 16 you cannot use the LastPass plugin on Safari. If using the iPad standalone without an external monitor, all is well. But when using an external monitor with Safari opened in the external monitor, LastPass does not prompt to login to a site that has a password stored in LastPass.
I am sure this is just something with the new features in iPadOS 16 that you haven’t gotten to yet. Just wanted to let you know about the problem.