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Pull Request for Issue #16912.
This PR reverts all but one replacement of call_user_func_array() in PR #13257 as the other ones "may" also cause similar problems.
I mistakenly assumed that the callable in those cases would be a string, but it might be an array that potentially can have many forms. Therefore I reverted other ones that might also cause issues, too.
Summary of Changes
Reversal of some changes of PR #13257
Testing Instructions
Check, that problem reported in issue #16912 has been resolved
Expected result
See issue #16912
Actual result
See issue #16912
Documentation Changes Required
None