I'm getting the feeling that this uses the older protocol?
I got a good answer to the above question from desdiv so I'm adding an edit:
Is there a reason to use this (and not use this) in place of KeePass2 on Windows?
2. On Linux, after entering the password the windows disappears, giving no UI feedback during the lengthy unlocking process. When you type the password wrong, it takes even longer for some reason, and there's no tray icon when you type the password wrong, so you'd have to minimize all your windows to find the dialog box all the way in the back.
3. Lacking Unicode support in 2017 is simply unacceptable: https://i.imgur.com/X0T46bY.png
None of this is the fault of the Keepass developers, since all three problems are absent in the Windows build. As far as I can tell the problem lies with Mono.
And Unicode works, yeah!
I have a really old computer and keepass2 opens stuff instantly so I'm guessing I'm probably not using good enough security.
Of course there could be other reasons.