TYPO3: pass categories to mask content element

Question

In a TYPO3 8.7 project I am using a DatabaseQueryProcessor to fetch the categories of a page and pass them as a parameter to fluid. Works.

But I want to have these categories in a mask content element as well. What is the best approach to achieve this?

Thank you!

Answer 1

I found a solution myself.

Problem was that I used the data processor on the page template level. Now I moved the data processor to a single typoscript object of type "FLUIDTEMPLATE" which is accessible inside a mask template as well.