MacOs 10.13.6 / C4D Studio R18.057 / Corona 5 HF2
I have the same problem as shown in the video.
Also, when changing projection type in texture tag, object disappears for a couple of seconds
This happens as long as there is a corona material applied - meaning if a c4d material is stacked to the right it also happens
Only when corona material is removed, the issue disappears.
This is new in V5.