TYPO3 Core

i get following PHP warning under PHP 7 on the first rendering after clearing the cache:

#1: PHP Warning: array_replace_recursive(): recursion detected in /home/xxx/public_html/typo3_src-7.6.5/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php line 838

the used typoscript inside an gridelements column that caused the error:

3 < lib.gridelements.defaultGridSetup
    3 {

        wrap = <div class="accordion">|</div>
        columns {
            10 < .default

            10.renderObj.20 {
                stdWrap.innerWrap.cObject.default.20.10.default.noTrimWrap = |acc_box| |
                text.10 = < lib.stdheader
                text.10 {
                    3 = LOAD_REGISTER
                    3 {
                        headerClass.cObject = COA
                        headerClass.cObject {
                            30 = TEXT
                            30.value =
                            30.noTrimWrap = | acc_trigger red| |
                        }
                    }
                }
                text.20.wrap = <div class="acc_content">|</div>
            }
        }
    }

on PHP 5.6 it's all fine.