"Your dungeon core has been destroyed" upon loading save

Hello,

when I load a saved game, the game takes a lot of time to initialize the display engine and the interface : after the proper loading screen, at first, the excavated tiles appears as unexcavated tiles, except that they are correctly lit, and the interface is not displayed ; I also see no mouse cursor and cannot do anything. After a minute or so, things are back in order. But sound effects are audible while this happens and I believe that game time is elapsing too. This also happens when starting a new game but then it lasts less time.

In a particular instance, namely the attached savegame profondeurs infernales_20180427150602 profondeurs infernales_20180427150602.meta(last level from My pet dungeon), things get beyond this annoyance as during this bizarre phase, the game determines my dungeon core has been destroyed and terminates the game.

I managed to continue this game by setting the display settings to a very low resolution (1024x576) and very low texture quality (12%). With these settings, the described phenomenon still happens, and the "Your dungeon core has been destroyed" message is still played, but the game does not actually terminates. Note that I usually run the game at 2560x1440 and 100% texture quality with no problem.