Doxygenclass is empty

[theaddonn]

I am using the newest version of doxsygen (1.9.7) together with breathe and breathe apidoc..

While trying to generate class info I noticed something really weird. While the files are filled with information the classes are pretty empty:

I don't quite understand how this could happen...
The class rst file for BlockPos is:

Class BlockPos
==============

.. doxygenclass:: BlockPos
   :project: AmethystApi

while the file rst file looks like this:

File BlockPos.hpp
=================

.. doxygenfile:: BlockPos.hpp
   :project: AmethystApi

The source file looks like this (BlockPos.hpp):

#pragma once

class BlockPos {
public:
    int x;
    int y;
    int z;

    BlockPos(int x, int y, int z)
    {
        this->x = x;
        this->y = y;
        this->z = z;
    }

    BlockPos below() const
    {
        return {this->x, this->y - 1, this->z};
    }
};

DId I do something wrong, because this definitly doesn't seem right?