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Hello @Smor2000 - as mentioned above, the studio does test out new features or modifications to current ones, so your piggy bank may have temporarily disappeared but hopefully it will come back. Also sometimes the amount of Gold Bars you can get from the piggy bank can change.
If for some reason you paid for your piggy Bank, but didn't get your gold bars - then you need to contact Player Support. Click here for more info: purchase issue page