Height of RenderTexture only 357 pixels

Hello Unity folks,

I'm trying to render a camera (reference stored in this.camera (GameObject)) to a RenderTexture (only in the Editor, so however, it works in my free version of Unity). The problem is, that renderTexture.height has the exact value of 1024 but texture.ReadPixels can only fetch a height of 357 pixels (LogError: Trying to read pixel out of bounds). I replaced the renderTexture.height for the Rect for the ReadPixels() call with some random value between 0 and 1025 and figured out, that the max height is 357. Below that cap all values work as expected. The other thing is, that I can fetch horizontal pixels without a limit (replacing renderTexture.width with 4096 for example) and theres no error.

Does anyone have the same problem or can you figure out what's going wrong here? I've tried to find the error the whole week but without any results.

Thank you for your answers.

Ps: Sorry for bad english.

Here's the relevant part of my code:

             int width = 1024;
             int height = width;
 
             RenderTexture renderTexture = new RenderTexture(width, height, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
 
             this.camera.camera.targetTexture = renderTexture;
             this.camera.camera.aspect = 1;
             this.camera.camera.Render();
 
             RenderTexture.active = renderTexture;
 
             Texture2D texture = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.ARGB32, false);
 
             texture.ReadPixels(new Rect(0.0f, 0.0f, renderTexture.width, renderTexture.height), 0, 0);
             texture.Apply();
 
             RenderTexture.active = null;
 
             return texture;