Actual Chest Unlock Time is consistently 7 minutes **MORE** than Minion suggested time

[Sibelios]

Platform, device and operation system
Android

What were you expecting to happen, and what actually happened
When selecting a chest to unlock using Minions, each minion based on their stats has a calculated unlock time displayed next to the Minion when choosing which Minion to task with unlocking the selected chest. The calculated unlock time for the minion should be the actual unlock time when the Minion is selected. Actually, once you select a minion for the task of unlocking the chest, the actual time to unlock is 7 minutes more. 2 examples below (1: Zappy unlocking Gold Chest; 2: Sickling unlocking Iron Chest)

How often does this happen? When did it begin happening?
Always; not sure when it started

Steps to make it happen again
Task a minion to unlock a chest.

[Sibelios]

After looking at this some more I think it must have something to do with the Gem “advance” where you can pay to expedite the opening of an already in process chest much like you can with followers in the middle of a craft process. However, I think it’s poorly coded to add 7 minutes onto the timer of every single chest to accomodate this rapid complete. I assume that was not the design intent.