When rendering to a texture, how to prevent camera from also rendering to screen?

Hi,

I've been working on a script that generates a thumbnail of a prefab (not used inside the editor) and it's working fine except that for a moment my thumbnail appears on-screen (bottom left). I couldn't find anything online about this so I'm asking here. Here's the code I'm using :

 IEnumerator RenderPrefab(GameObject prefab, int width, int height, Action<Texture2D> callback)
 {
     var cameraContainer = prefab.GetChild("PictureCamera");
     var camera = cameraContainer.GetComponent<Camera>();
     
     yield return new WaitForEndOfFrame();
 
     // Camera Container is inactive initially, so we activate it now
     cameraContainer.SetActive(true);
 
     // Backup active render texture
     var originalActive = RenderTexture.active;
 
     // RenderTexture setup
     var renderTexture = new RenderTexture(width, height, 24, RenderTextureFormat.ARGB32);
     RenderTexture.active = renderTexture;
     camera.targetTexture = renderTexture;
 
     // Actual rendering
     camera.Render();
     
     // Copy RenderTexture to Texture2D
     var output = new Texture2D(width, height, TextureFormat.ARGB32, false);
     output.ReadPixels(new Rect(0, 0, width, height), 0, 0);
     output.Apply(false);
 
     // Revert active render texture
     RenderTexture.active = originalActive;
 
     // Cleanup
     Object.Destroy(renderTexture);
     cameraContainer.SetActive(false);
     Destroy(prefab);
 
     // Done
     callback(output);
 }