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"Clear value" wizard in page config not present any more
Adding wizards via ['config']['wizards'] was removed for TYPO3 8.6: https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/8.6/Deprecation-79440-TcaChanges.html
The "clear value" wizard (rendered when clearable="1" on a form field) is still being included with this method: https://github.com/FluidTYPO3/flux/blob/3121e6d/Classes/Form/AbstractFormField.php#L227-L235
As far as I can tell, this should not work any more with any TYPO3 version supported by current vhs. It would have to be replaced with one of the new wizard registration methods.
Flux needs to convert the old "renderClearValueWizardField" into a FieldControl class as described in https://docs.typo3.org/m/typo3/reference-coreapi/10.4/en-us/ApiOverview/FormEngine/Rendering/Index.html#node-expansion
(The field tag attribute is clear="1", not "clearable".)