As the title says. I was playing in endless mode and am about 10 adventures in. Swapped to the boneguard while the choice was up whether to take from the chest or not. Took from the chest and received 2 curses. Neither was discarded as it should have been by the boneguard, since this was the 2nd or 3rd encounter since the start of this level and I hadn't recieved a curse since then.

Unless the Cursed Boneguard only prevents one curse ever? Not a very clear description then though because the Gladiator's Visage is worded the same way but applied to every new level rather than just once ever.