Lock date interfering with form defaults

I just enabled payslips for one of my clients, and I was trying to make changes to the form defaults but I get this message:
" Lock date is in place as at 2020/01/01. You can only update or delete transactions dated after this date."

I have nothing entered in payslips and any changes in form default takes effect after the change and do not affect any previously entered transactions.

I solved this problem off course by removing the lock date temporarily, but that should not be the case. This might be a bug.

I can replicate this bug and have moved the topic to the bugs category.

Fixed in the latest version (20.10.90)