Google Merdian Budget Optimization when KPI is non revenue

Hi Google,
I tried multiple iterations when kpi is non revenue and seeing in flexible budget it does not allocate like when kpi is revenue and it does not show cpik. Is fixed budget is used for Google Merdian to see how budget is reallocated across channel. Since I have seen in fixed budget they are allocating rather than flexible budget

Start by reproducing the reported behavior for non-revenue KPIs in flexible and fixed budget optimization, comparing budget reallocation and CPIK output. The issue names no files, tests, or entry points, so first locate the relevant budget optimization code and existing tests. Done means the behavior is understood and the expected allocation and CPIK handling are covered by tests.

Written by the indexing model from the issue text.