The most glaring issue (for me, anyway; I fully understand I'm just a sample size of 1!) they have is relying on the pop-up UI of the browser, which I guess is stateless (state is lost when the popup closes, it seems?). The decision of using this UI was already wrong from its inception, IMHO, not sure why they thought it would be a good idea. But more surprising is that they haven't yet moved to the much more reliable and user friendly method of opening their UI on a new tab, which was a no brainer when using LastPass. Oh well. They said to have this in the backlog, so hopefully it gets some attention sooner than later... but in the meantime the end users are faced with silly issues like this, software that loses user data should not be a concern in the first place, and for sure they won't care about some technical explanation about how the browser handles pop-up windows.
(for anyone interested: https://community.bitwarden.com/t/persist-bitwarden-ui-and-m...)