KeepassXC won't lock when I lock my session even though I have enabled it in the options.

Expected Behavior

I have clicked the option "Lock databases when session is locked" in the Security panel.
KeepassXC is opened an has his database opened.
I lock my session using Super + L in gnome
When I unlock the session, Keepass has locked the database and asks me the unlock password.

Current Behavior

I have clicked the option "Lock databases when session is locked" in the Security panel.
I lock my session using Super + L in gnome
When I unlock the session, Keepass is still here with the database opened.

Possible Solution

No idea

Steps to Reproduce (for bugs)

See description above.. it is quite simple.

Context

Your Environment

Ubuntu 17.04 Zesty with Gnome 3
KeePassXC v2.2.0 installed with Snap