This Morning I was working on a Nature Monster Chest. Due to time and being impatient, I decided to use a number of Loot Tickets to help fill the chest. After using 10 Loot Tickets, and collecting the rewards. I noticed that the number of monsters on the chest did not increase. It was the same number before I used the tickets.
This is normally not an issue with a regular monster chest, this was however the first time I used a ticket on an elemental chest.
Version: 20.1.2 Build 970
EST, 730(ish) 18 April 2019