The Rain Festival Beetle - Unique Strongbox not working with Omenof Secret Compartments

Hi,
so i had ACTIVE Omen of Secret Compartments, and tried to open Rain Beetle unique strongbox in maps tier 10.
After defeating it once, it was dead, not reopenable. But my Omen was consumed.
I tried detonating the body, but after reloading it goint to hideout and back it was still not reopenable.