I haven't had this for few days anymore, but thought I'd report it whilst I remember it.
Early last week bank heist was acting up real bad.
Although it was enabled and bank was ripe for hit when users did !bankheist x it didn't print anything, no matter what amount you tried.
Temporarily solution was to re-enable bank heists, then it worked for one heist but when cooldown was completed it didn't work until I re-enabled it again.
No clue what was going on here, though.