I don't think it's useful but it's not worth arguing about.

This behavior also goes away if you set the configuration variable ‘cperl-indent-region-fix-constructs’ to nil.

I don't know of any other language mode in Emacs, or even another instance in cperl-mode, where an unfinished statement of any kind, like a /* in c-mode or an open quote " without its closing quote causes an error message to appear.

Well, parens (of any kind) are sort of magical in Emacs, even in situations where they should not be, like within comments or strings. Comments and strings, on the other hand, have ... a different kind of magic.

I am still at a loss why the message would cause scrolling. Emacs emits warnings rather frequently without any scrolling taking place. I have a hunch that the issue is not caused by CPerl mode. There are similar cases, which might help to narrow down the issue:

• Start with an empty buffer and hit } (or any other "closing" paren). This should - in any mode - cause a message No matching parenthesis found. Does this message also cause scrolling for you?
• Does the issue go away if you set the variable blink-matching-paren to nil or t? A value of 'jump (which was the default for some time) can indeed cause unwanted scrolling.

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