There seems to be a problem with Fluid Templates from TYPO3 8.7: e.g. here: typo3/sysext/fluid_styled_content/Resources/Private/Templates/MenuSubpages.html
typo3/sysext/fluid_styled_content/Resources/Private/Templates/MenuSubpages.html
TYPO3 Versio: 8.7.8 Fluid Plugin Enterprise: 1.4.0 PhpStorm: 2017.2