TYPO3 Core

the register['count_menuItems'] is set, before a possible userfunc filters the menu items -> wrong register value.

2 possible solutions:
a) change call sequence
b) require the userfunc to update the register.

I would prefer a) as b) is not very obviuos and the userfunc will could still get the count by simply using php count on the array if necessary.

// Setting number of menu items
            $GLOBALS['TSFE']->register['count_menuItems'] = count($this->menuArr);
                //    Passing the menuArr through a user defined function:
            if ($this->mconf['itemArrayProcFunc'])    {
                if (!is_array($this->parentMenuArr)) {$this->parentMenuArr=array();}
                $this->menuArr = $this->userProcess('itemArrayProcFunc',$this->menuArr);
            }

(issue imported from #M18050)