upx 5.0.2 - Help message truncated

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What's the problem (or question)?

I'm using upx 5.0.2 on msys2. When running upx --help in bash/zsh, the output will be truncated at "file.. executables to (de)compress", everything above is lost, including some of the output from previous commands.

I've tried to run seq 100 then upx --help, and the output is like below

...
48
49
50
51
52
53
54
55
file..   executables to (de)compress

This version supports:
    amd64-darwin.dylib                   dylib/amd64
    amd64-darwin.macho                   macho/amd64
    amd64-linux.elf                      linux/amd64
    amd64-linux.kernel.vmlinux           vmlinux/amd64
    amd64-win64.pe                       win64/pe
...

However, if I use upx --help | less, then everything is correct.

I've tried both windows terminal and mintty, and the result is similiar (though the tuncation point differs).

What should have happened?

upx --help outputs correctly

Do you have an idea for a solution?

Not yet.

How can we reproduce the issue?

Already described above.

Please tell us details about your environment.

• UPX version used (upx --version):

upx 5.0.2
UCL data compression library 1.03
zlib data compression library 1.3.1.1-motley
LZMA SDK version 4.43
doctest C++ testing framework version 2.4.11

• Host Operating System and version: Windows 11 24H2 26100.7462, with up to date Msys2.
• Host CPU architecture: x86_64
• Target Operating System and version: N/A
• Target CPU architecture: N/A