I just signed in to a site which complained about my email address being wrong. It turned out my email address was stored in 1Password with a trailing space. I guess no valid email address has spaces anywhere, so it should be safe to trim both initial and trailing space from email address when storing in vault.
1Password Version: 8.9.4
Extension Version: 2.3.7
OS Version: Fedora 36
Referrer: forum-search:Trim trailing space