Bill number error

Dear Akainting support team, let me describe a bug:

Given: web version Version 2.1.1
When: I create a new bill.
Then: The bill number stays as the previous bill number.
Expected result: The bill number should increase automatically +1 to the previous one. (it worked this way in previous version)
As a case: I created a bill with let's say BILL-00202. Then I create another one and the bill number field, as a default still "BILL-00202".
In the previous version it was like +1 to the latest bill number so it should be "BILL-00203"
If you have some questions I'm ready to answer.