Roulette, blackjack and table games
Can the blackjack dealer have a blackjack after I've already doubled down?
Direct answer
Dealer-peek and no-hole-card rules change exposure to extra bets; check the game's specific insurance and hole-card procedures.
How to use this answer
The principle is supported by the referenced rules, but a different operator or market can apply a different settlement condition. Treat the named provider as a specific example, not as a universal betting rule.
Separate the game’s mathematical probabilities from the casino’s house procedure. The odds may be calculable even where split, surrender, side-bet or payout policies differ between tables.