https://github.com/JuliaDiff/ChainRulesCore.jl/runs/1569643044?check_suite_focus=true Investigating, I think it has to do with the [`ChainRulesTestUtils` update](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/pull/84) rather than with the [`ChainRulesCore` one](https://github.com/JuliaDiff/ChainRulesCore.jl/pull/264).