Do the Texture2D methods behave differently in a release build?

I try to reduce the size of a texture by half. For this I use the code

 Color32[] tOrigData = mCurrentTexture.GetPixels32(1);
 mCurrentTexture.Resize(mCurrentTexture.width >> 1, mCurrentTexture.height >> 1, mCurrentTexture.format, true); 
 mCurrentTexture.SetPixels32(tOrigData, 0);
 mCurrentTexture.Apply(true, false);

which works fine in the editor. If I build for Windows however the result is just a white texture, as if Apply() was not called.

Maybe this is a bug or I misuse it. I didn't build for any other platform yet and will update this post once I tried a different platform.

I also tried to copy the Color32[] array shallow and deep, and both didn't work.

Thanks in advance for any help!