There appears to be a glitch with the new Insect horde event that can randomly spawn in a realm, This. Glitch turn the event completly invunerable, making it impossible to kill and, in turn, cause the realm to stay forever open until the server restarts.
The cause of this glitch is still unknown and community investigation is required.
The glitch was recorded in the EUSOUTH server.
A picture of the glitched event.