I have exactly same problem. Most of the time, safari browser extension is working fine, but with some sites (my bank site for example), when i clic on the extension, nothing happens and Enpass app starts heating all my CPU and freezes. I have to force quit the app, then open again. Then login is working as long as i don't refresh the page. Just after retarting the app, if i refresh my webpage : once again the app freezes.
I have enabled and disabled autofill option : same behaviour.
I have tried with the app store version and with the site one : same behaviour
I have downloaded the beta one (6.8.4 (1165)) : same behaviour.
And i am working with M1 Macbook pro and latest ventura software.
Thanks for your help