Data Exchange bugs out when exporting multiple years from a planning application, even C2C

Summary:

All versions of Cloud FDMEE (Data Exchange/Data Management) have a longstanding bug when exporting data from multiple years and periods in one operation - the year data will be mismatched and mapped to all corresponding periods.

Simple example:

Running this command exports 12 periods in our financial year from planning application DechProd to another Planning application, GroupFin, using the built-in Cloud-to-Cloud connector in Data Management.

We receive one row in Jul-22, the correct row value of 200.

Same rule, but run as two years instead:

Produces two rows in Jul-22, the correct Jul-22 row from before, and also a Jul-23 row: