Hi @SebFischer,
The temporal and predefined filter on the page is specific to the dataset that you choose. It doesn't trigger analytical operations such as Spatial aggregation and spatial filters that are created using this dataset. Spatial Aggregation is a new result dataset in your data pane.
Depending on your data and what you want to achieve, instead of spatially aggregating, you can join these datasets either using Spatial or Attribute join. This way you can retain all the columns from both sides. Then, use this dataset to create visualizations and a temporal filter on the page.
Let me know if that helps. Feel free to ask any follow-up questions.
Thanks,
Akshay Harshe