I think that the game on mobile has issues with an opponent playing ‘Plot Twist’ if they’re N’Zoth.
So I was playing against a Quest Warlock in standard, and they happened to have the N’Zoth hero portrait and card back on. A few turns into the match he played ‘Plot Twist’, which is to be expected. However as soon as he started to shuffle his hand, my game closed itself out. Playing on mobile it’s not the biggest issue since I can just restart the app and go back into the game, but it’s still annoying. After they played their second ‘Plot Twist’, my game crashed again! So that’s what prompted me to make a post about it, since I didn’t know if anyone experienced this issue.
PS: I preordered the expansion and have N’Zoth too, and I can confirm that playing ‘Plot Twist’ yourself does not pose any issue. I also noted that N’Zoth plays a special voice line when playing ‘Plot Twist’, and I think this voice line might be part of why it’s crashing, since it’s only with N’Zoth.