CI failure: `derivative wrong: Test Failed`

On Julia 1.0, ubuntu: https://github.com/JuliaDiff/ChainRulesTestUtils.jl/runs/4862197179?check_suite_focus=true

Not really sure what the cause is, will rerun

   Testing ChainRulesTestUtils
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 Resolving package versions...
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derivative wrong: Test Failed at /home/runner/work/ChainRulesTestUtils.jl/ChainRulesTestUtils.jl/test/testers.jl:544
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  Expression: fails((()->begin
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            test_rrule(my_identity2, 2.2)
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        end))
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Stacktrace:
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 [1] macro expansion at /home/runner/work/ChainRulesTestUtils.jl/ChainRulesTestUtils.jl/test/testers.jl:544 [inlined]
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 [2] macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.0/Test/src/Test.jl:1083 [inlined]
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 [3] macro expansion at /home/runner/work/ChainRulesTestUtils.jl/ChainRulesTestUtils.jl/test/testers.jl:532 [inlined]
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 [4] macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.0/Test/src/Test.jl:1083 [inlined]
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 [5] macro expansion at /home/runner/work/ChainRulesTestUtils.jl/ChainRulesTestUtils.jl/test/testers.jl:515 [inlined]
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 [6] macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.0/Test/src/Test.jl:1083 [inlined]
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 [7] top-level scope at /home/runner/work/ChainRulesTestUtils.jl/ChainRulesTestUtils.jl/test/testers.jl:69

Start by reproducing the Julia 1.0 Ubuntu failure from the linked CI run and inspect test/testers.jl around line 544, especially the test_rrule(my_identity2, 2.2) case. The work is done when the failing test passes reliably in the affected CI environment.