Stability concerns at playhouse - Is the finger joint damaged?

Dear forum,

I hope you can help me. We have just built or rather partly had built a playhouse. Of course, safety is very important to me, so that everything is very stable; that's why I insisted on six 12x12 beams even though the craftsman thought it was exaggerated (the house is 3x2 meters and weighs about 300 kilos). Now I wanted to start the protective coating and found "weird notches" that do not look quite right to me on the 2-meter span. The lower frame was completely built by a craftsman and the materials were provided by him. I then googled these notches and have serious concerns whether our crossbeam is damaged and weakens the statics. I hope you can reassure me; I thought I had planned everything with a large safety margin, and then something like this. The first picture shows the location, then there is the stamp on the beam, which unfortunately tells me nothing except that it looks like a CE mark. Then the potentially damaged spot from inside and the playhouse.

Thanks for all assessments/advice!

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all good, the craftsman built it solidly and securely

The substructure is very solid.

The roof structure is rather questionable. Is there a ridge beam?

Do you have a picture from the front, please?

So the scarf joint is permissible for Nsi (not visible) and static, from a structural point of view it is harmless. An offset or a bevel of 3 or 4 mm is common in Kvh.

Oh, and 12*12 on 2m can be loaded with 700kg traffic load each (which is allowed to bounce) without anything happening. So nothing stands in the way of the covered jacuzzi.

Completely forgotten: I would extend the tongue and groove facade one row further down, also under the terrace. Otherwise, all the beam ends are fully exposed to the weather, possibly the facade even drips directly onto them.