I rebuild emacs28.1 as you said, but it still reproduce the problem.
Please refer to the attachment.

2022-07-18 08時49分15秒 /home/bruce/bin/emacs-28.1/src  bruce 2047$
head xselect.c

#define TRACE_SELECTION

/* X Selection processing for Emacs.
    Copyright (C) 1993-1997, 2000-2022 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at

On 2022/7/17 下午9:07, Po Lu wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
>
>> Bruce, can you build Emacs with that option enabled and provide us
>> with the traces?
> BTW, if it wasn't already clear, to do that simply place this line:
>
>    #define TRACE_SELECTION
>
> at the top of src/xselect.c before building Emacs.
>
> Thanks in advance.