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There are indeed no reports of any problems with the ZA 85. The hood attaches to a solid integral part of the lens, unlike the ZA 135. The drawback is, you give the 135 hood a bump, only the weak front part will break, but with the 85, you might also damage the focusing gears.
As for storage, I used to keep the hood in reversed position, at the risk of having the lens slip from my hand at several occasions, as there is very little area to hold to the lens when the hood is reversed.