Then that's your fault as a bank robber for losing space. If that's the case, you need to fall back down to the vault.
You also should have a teammate holding it from the side to prevent that from happening
Maybe I'm being biased because I am a TFU main and haven't done enough bank robberies as a crim in V6, but I don't understand the issue
It's already a massive benefit to you that cops can't see you from multiple angles since the shutters block their line of sight (yeah, that comes at the cost...