Render distance >16 chunks not working on my iPad Pro

On Minecraft for my iPad Pro, the video options display render distances up to 8, 16, 24, 32, 40, and 48 chunks.   Up to 8 and 16 chunks works normally; however, when I try to use render distance of 24 chunks and above, it acts differently.  I can see the faint silhouette of chunks/terrain beyond 16 chunks, but only up to 16 chunks does it actually really show parts of the world.  I have found this odd and mildly disappointing as I hoped to take advantage of the higher render distance.

I currently have a shader pack on; however, even removing this shader does not fix the issue.  I am not sure why this is happening.  I will attach a screenshot; in it I set my render distance to 40 chunks, but stuff I have built beyond 16 chunks is only faintly silhouetted by the game.

If anyone knows why this is happening, if it is a bug I can fix or which will need to be fixed elsewhere - please feel free to discuss.