Empty squares in rendered image

your file back

this needs some time... first I confirm your results and this is a known issue with workarounds

• locking the canvas at that size is why cloud rendor has issues

• for the ground line you will get beter results by having the hoz line set and tone down that ground shadow

• the new rendor has a major bug with transparency... an effect of that is layers that are hidden STILL rendor shadows at Med or High so you need to delete these parts for your final rendor

• I replaced your custom glass material with the new Dimension glass... this is optional but ime the best when you want Med or high settings

• the rendor layer in Psd has an auto cleanup layer and this is what makes your missing squares more than any thing else, the best work flow is to always rendor Psd files because you can then adjust the final rendor by eye {see example in returned files} ... for best results on complex designs you should mask bits of the two rendor layers i.e, take control away from Dimension
• the morral here is never trust an AI to do a human job

final rendor example

shadow = 40%... still has some room for polish but you get the idea