Priming the screed before tiling with deep primer?

Hello!

I have already heard various opinions on the topic, from 'always prime', to 'it depends', to 'definitely not', and I am now quite unsure ... Now I am curious which opinion predominates here.

It is clear that the new screed must first dry properly before laying the tiles; it still has a certain (allowed) residual moisture. And because of this, some believe that it is better to skip the priming, as otherwise there could be problems with it. But the screed will probably continue to dry over time; can this then have negative effects on the tile adhesive and cause the tiles to loosen later, or is this only relevant at the time of installation?

And if it is better to prime after all, is simple primer (on an even floor) sufficient? Or should it be something special?

Best regards

Floor surfaces must be thoroughly cleaned before laying ceramic tiles, possibly smoothed (leveled with a filler) and then always primed! The residual moisture of the screed has nothing to do with the consideration of YES/NO/PERHAPS. The amount of water that hits a screed surface with a primer is on the one hand very low, on the other hand, it already dries completely within about 2 hours. If not primed, possible hollow spaces in the tile layer are the result because the water from the adhesive is "wicked away," eagerly absorbed by the screed.

Thank you very much for the response! :)