https://github.com/NilFoundation/zkllvm-blueprint/blob/93b6463d8d6378e08994c3208fbed34f90b30fa7/test/test_plonk_component.hpp#L286C38-L286C38

The component tester assumes that all components use at most 1 column for constants. We have components that in some configurations where the component fits into a single row, we require 2 constants, and therefore 2 constant columns.

Could the testing framework not get the number of used constant columns from the component itself?
Furthermore, the component stretcher also assumes that there is at most 1 constant column.