The readdir library recognizes files as folders while getline is used

[Евгений]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -march=x86-64 -mtune=generic -O2 -pipe -fno-plt 
-fexceptions         -Wp,-D_FORTIFY_SOURCE=2 -Wformat 
-Werror=format-security         -fstack-clash-protection -fcf-protection 
-g -ffile-prefix-map=/build/gawk/src=/usr/src/debug/gawk -flto=auto -DNDEBUG
uname output: Linux Yoga-12 6.1.31-2-MANJARO #1 SMP PREEMPT_DYNAMIC Sun 
Jun  4 12:31:46 UTC 2023 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Gawk Version: 5.2.1 (downgraded from 5.2.2)

Attestation 1:
    I have read 
https://www.gnu.org/software/gawk/manual/html_node/Bugs.html.
    Yes

Attestation 2:
    I have not modified the sources before building gawk.
    True

Description:
    If the library `readdir` in 5.2.2 version is loaded, the `getline` 
instruction works incorrectly while reading a file. It recognizes files 
as directories and returns an error. The 5.2.1 version does not have 
this issue and works properly.

Repeat-By:
    #!/usr/bin/gawk -f
    @load "readdir"
    BEGIN{
        while((getline < "file.txt") > 0){
            print $0
        }
    }