So stocks or bonds held under custody of a bankrupt bank are completely lost for the clients?Usually when this happens, a liquidator is appointed, and you have to contact them to know what the process for retrieval of funds is. This can unfortunately take weeks and months, even years in some cases.
Investments often aren't covered, meaning that even if deposits are safe, investments might not. Keep an eye on the bank's website and EAS (Payout event Sora Bank - Englisch).