Reads file command 'r' not support Group commands '{ cmd ; cmd ... }'

[tinyhare]

root@house:~# echo 'bbbbb' > file.txt
root@house:~# echo -e "aaaaa\nBBBBB\nccccc" | sed -e '/BBBBB/ r file.txt' -e '/BBBBB/ d'
aaaaa
bbbbb
ccccc
root@house:~# echo -e "aaaaa\nBBBBB\nccccc" | sed '/BBBBB/ {r file.txt;d}'
sed: -e expression #1, char 0: unmatched `{'
root@house:~#
root@house:~# sed --version
sed (GNU sed) 4.9
Packaged by Debian

[tinyhare]

I think the problem is at here：

sed/sed/compile.c

Line 284 in 8edd37f

read_filename (void)

it reads all chars after 'r' command as the file name, it stoped only at the EOF and '\n'.
so if I add a new line, it will ok:

root@house:~# echo -e "aaaaa\nBBBBB\nccccc" | sed '/BBBBB/ {r file.txt
> d}' 
aaaaa
bbbbb
ccccc

In the code, there is someone seems want to solve some problems and 'had second thoughts' at last. ;-(
I add some characters in the while condition to leave the loop.
I don't know whether it has sideffects but it workd now.

read_filename (void)
{
  struct buffer *b;
  int ch;

  if (sandbox)
    bad_prog ("e/r/w commands disabled in sandbox mode");

  b = init_buffer ();
  ch = in_nonblank ();
 // while (ch != EOF && ch != '\n')
 while (ch != EOF && ch != '\n' && ch != ' ' && ch != ';' && ch != '}')
    {
#if 0 /*XXX ZZZ 1998-09-12 kpp: added, then had second thoughts*/
      if (posixicity == POSIXLY_EXTENDED)
        if (ch == ';' || ch == '#')
          {
            savchar (ch);
            break;
          }
#endif
      ch = add_then_next (b, ch);
    }
  add1_buffer (b, '\0');
  return b;
}

./configure && make

root@house:~# echo -e "aaaaa\nBBBBB\nccccc" | sed '/BBBBB/ {r file.txt;d}'
sed: -e expression #1, char 0: unmatched `{'
root@house:~# echo -e "aaaaa\nBBBBB\nccccc" | /tmp/sed-4.9/sed/sed '/BBBBB/ {r file.txt;d}'
aaaaa
bbbbb
ccccc
root@house:~# 

Does anyone have a better suggestion?