Some manpages generate files

[WQY916]

When I use the vim -c "Man $*" -c "silent only"replacement man provided inside the documentation,Normally, vim will display the title "cmd manpager[-]"
but occasionally the title will display "cmd manpager[+-]", and it does not follow the man operation.
For example, in this case, the q command cannot be used to exit the man interface, and after using ctrl-w+q to exit the man interface, a file named "cmd manpager" will be generated in the current directory.
After I checked the vim documentation, I wrote a command myself: vim -c "r!command man $*" -c "silent file $1 manpager" +MANPAGER. It works fine.
I can't understand the reason of this sporadic problem,However, the manpagers that have this problem when tested on my device are: yt-dlp, jq, scrcpy.