Thaumcraft 3 Cow farm with Golems

[Alice]

I recently just built a cow farm using a tier 5 soul shard, an advanced smart golem and a wooden golem (who collects the drops) - very similar to Direwolfs in his server play video (but with out the technical computer part!) and I have 3 brains in jars places around the farm, but the cows are not dropping XP when the advanced smart iron golem kills them

Has Azanor changed it in the recent update that mobs killed by golems do not drop XP?
If not - any ideas what I am doing wrong?

I was planning on using this as a food production and XP production farm, so much help would be appreciated.

Here are a couple of screenshots:

Spoiler

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[Captain Neckbeard]

The Iron Golems need Visors for the mobs to drop experience. Always been that way, to my knowledge.

 

[Alice]

The Iron Golems need Visors for the mobs to drop experience. Always been that way, to my knowledge.

Thank you!
Ahhhhh - well that explains it. Do you need knowledge fragments to research visors or is there another way?

 

[Captain Neckbeard]

All the Golem Accessories are from fragments.

 

[vineet]

All the Golem Accessories are from fragments.

Really?!

 

[Captain Neckbeard]

Unless you count Animation Cores as accessories. The armor, hats, bowties, glasses, etc. are all from fragments. Get into Thaumic Bees if everyone on your server's depleted all the nearby ADVENTURE! before you could get your murderhobo on.