Windows: bad argument #1 to 'getconsoleflags' (invalid file handle)

[ngvt1n]

On Windows 10, Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio, luasystem 0.6.2-1:
Minimal example:

local system = require "system" 
system.getconsoleflags(io.stdin)

Gives:

.\flag_windows.lua:2: bad argument #1 to 'getconsoleflags' (invalid file handle)
stack traceback:
        [C]: in function 'getconsoleflags'
        .\flag_windows.lua:2: in main chunk
        [C]: ?

which traces back to this line in system/init.lua:

    if system.isatty(io.stdin) then
      backup.console_in = system.getconsoleflags(io.stdin) -- <--------
      backup.term_in = system.tcgetattr(io.stdin)
    end

Notably the error doesn't occur on Lua 5.4.2

[Tieske]

I cannot reproduce this. I tried toolchains: MinGW-64, MSVC-32 and MSVC-64, but all worked for me.