After some testing, I have found that #[0] and flamingo extension for Nostr keys are both buggy for me. So far it looks like Nos2x is the only one that actually works consistently. So, that's my new recommendation for key management: https://chrome.google.com/webstore/detail/nos2x/kpgefcfmnafjgpblomihpgmejjdanjjp/related