`OrdinaryDiffEqNonlinearSolve` - Type instability in relaxation

[SouthEndMusic]

Chtulhu says about relax! here:

MRE can follow if requested.

[ChrisRackauckas]

That looks like it would be a false positive? I don't see why alpha would be boxed. Needs an example

[oscardssmith]

I believe this is a false positive. (or possibly fixed by #2729)