Ah Ha! So, the pineapple was added to the boil. Then the enzyme was likely denatured. Obviously, there may be some pectic enzyme, but who cares in a wheat! Good to know. How much pineapple did you use?
(Sorry to hijack the thread
I have made a couple of coconut beers in my day. If it's in a keg, I think the head retention is a non-issue. The beer is pulled from the bottom while the oils from the coconut float on top. At least that has been my experience.