Why the number of the yanked line is too many(may be over 22) the command line will not show if the line was copied ?

I mean when I copy several line in the vim, the command line will show the lines has been yanked. But when number of yanked line is over 22(I test it), the command line will show nothing when the copy is done. But it becomes a little inconvenient for me that I don't know whether the copy is successful.
How to set the vim to show the yank is successful when the copy is done?


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