joinpath behave weirdly when forbidden characters are used on windows #58929
Description
Description:
When using joinpath on Windows, instead of the full path returned, only the last element is returned.
Bug Steps
using Dates
function bug_test(folder::String, config_prefix::String)
timestamp = Dates.format(now(), "yyyy-mm-dd_HH:MM:SS")
log_file = abspath(joinpath(folder, "run_$(timestamp)_$(config_prefix).log"))
log_file_jp = joinpath(folder, "run_$(timestamp)_$(config_prefix).log")
println("Folder : $folder")
println("Full path to log : $log_file_jp")
println("Full abspath to log : $log_file")
endpwsh>julia --threads=auto
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julia> include("./bug.jl")
bug_test (generic function with 1 method)
julia> cd("C:\\test")
julia> bug_test(raw"C:/test/01","01")
Folder : C:/test/01
Full path to log : run_2025-07-08_12:01:57_01.log
Full abspath to log : run_2025-07-08_12:01:57_01.log
julia> bug_test("C:\\test\\01","01")
Folder : C:\test\01
Full path to log : run_2025-07-08_12:02:02_01.log
Full abspath to log : run_2025-07-08_12:02:02_01.log
julia> bug_test(raw"C:/test/01","01")
Folder : C:/test/01
Full path to log : run_2025-07-08_12:02:09_01.log
Full abspath to log : run_2025-07-08_12:02:09_01.logVersion
Julia Version : 1.11.5
Powershell : 7.5.2
Windows 11 Enterprise 24H2 (26100.4061)