Bug 452497

STEPS TO REPRODUCE (There are probably other ways too)
1.  Create a scheduled monthly transaction with next due date in the future
2.  Choose "This schedule will end at some time" (number of transactions remaining defaults to 0 with date = today -- OK)
3.  Increment number of transactions until it gets to 12 (date of final transaction updates correctly)
4.  Click OK to save the schedule
5.  Edit the schedule just created and decrement the number of transactions to 11 (final date updates OK)
6.  Increment the number of transactions back to 12

OBSERVED RESULT
Date of final transaction does not update in the final step

EXPECTED RESULT
Date of final transaction updates OK

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.24
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.13.0-39-generic (64-bit)
Graphics Platform: X11
Processors: 2 × AMD A6-6400K APU with Radeon(tm) HD Graphics
Memory: 7.7 GiB of RAM
Graphics Processor: AMD CEDAR

ADDITIONAL INFORMATION
There is something wrong with the logic that updates these fields -- in my 'live' database I have schedules that show e.g. number of transactions = 10, but date of final corresponds to 12 payments, and if I increment the number of transactions, to 11 it decreases the date of final to correspond correctly.

A consequence also seems to be that reports that show scheduled transactions do not show the right number.