Package errored during testing on Github Actions (exit code 541541187)

General Usage
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For some reason that I don’t understand, tests for a package that I’m working on keep failing on Windows with the following error message:

ERROR: LoadError: Package ApproxFunOrthogonalPolynomials errored during testing (exit code: 541541187)
Stacktrace:
 [1] pkgerror(msg::String)
   @ Pkg.Types C:\hostedtoolcache\windows\julia\1.8.5\x64\share\julia\stdlib\v1.8\Pkg\src\Types.jl:67
 [2] test(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; coverage::Bool, julia_args::Cmd, test_args::Cmd, test_fn::Nothing, force_latest_compatible_version::Bool, allow_earlier_backwards_compatible_versions::Bool, allow_reresolve::Bool)
   @ Pkg.Operations C:\hostedtoolcache\windows\julia\1.8.5\x64\share\julia\stdlib\v1.8\Pkg\src\Operations.jl:1813
 [3] test(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; coverage::Bool, test_fn::Nothing, julia_args::Vector{String}, test_args::Cmd, force_latest_compatible_version::Bool, allow_earlier_backwards_compatible_versions::Bool, allow_reresolve::Bool, kwargs::Base.Pairs{Symbol, IOContext{Base.PipeEndpoint}, Tuple{Symbol}, NamedTuple{(:io,), Tuple{IOContext{Base.PipeEndpoint}}}})
   @ Pkg.API C:\hostedtoolcache\windows\julia\1.8.5\x64\share\julia\stdlib\v1.8\Pkg\src\API.jl:434
 [4] test(pkgs::Vector{Pkg.Types.PackageSpec}; io::IOContext{Base.PipeEndpoint}, kwargs::Base.Pairs{Symbol, Any, Tuple{Symbol, Symbol, Symbol}, NamedTuple{(:coverage, :julia_args, :force_latest_compatible_version), Tuple{Bool, Vector{String}, Bool}}})
   @ Pkg.API C:\hostedtoolcache\windows\julia\1.8.5\x64\share\julia\stdlib\v1.8\Pkg\src\API.jl:156
 [5] test(; name::Nothing, uuid::Nothing, version::Nothing, url::Nothing, rev::Nothing, path::Nothing, mode::Pkg.Types.PackageMode, subdir::Nothing, kwargs::Base.Pairs{Symbol, Any, Tuple{Symbol, Symbol, Symbol}, NamedTuple{(:coverage, :julia_args, :force_latest_compatible_version), Tuple{Bool, Vector{String}, Bool}}})
   @ Pkg.API C:\hostedtoolcache\windows\julia\1.8.5\x64\share\julia\stdlib\v1.8\Pkg\src\API.jl:171
 [6] top-level scope
   @ D:\a\_actions\julia-actions\julia-runtest\v1\test_harness.jl:15
 [7] include(fname::String)
   @ Base.MainInclude .\client.jl:476
 [8] top-level scope
   @ none:1
in expression starting at D:\a\_actions\julia-actions\julia-runtest\v1\test_harness.jl:7
Error: Process completed with exit code 1.

The tests work on Linux and MacOS.

I wonder if someone has come across this before? I suspect that this might be due to excessive resource consumption in the testset, but the error message is too cryptic for me.