https://github.com/SciML/OrdinaryDiffEq.jl/pull/2233 merged slightly too early, but this fixes the failing test. The problem was that the test was comparing a QNDF solve to an FBDF solve where the solves had an abstol of 1e-8 but we were looking for agreement of 1e-8. Reducing the abstol of the solve to 1e-10 fixes the failure.
https://github.com/SciML/OrdinaryDiffEq.jl/pull/2233 merged slightly too early, but this fixes the failing test. The problem was that the test was comparing a QNDF solve to an FBDF solve where the solves had an abstol of 1e-8 but we were looking for agreement of 1e-8. Reducing the abstol of the solve to 1e-10 fixes the failure.