Efficiency 1 item (Cap/Pants/Tunic/Boots/Gapple) in Woodland Mansions

Steps to reproduce

1. Create a world using the "Spooky Mansion" seed from the seed picker.
2. Travel to 240 71 124
3. Look in the chest.

Expected result
Normal things in the chest. (Maybe should be Efficiency 1 Iron Axe per BDS-10163.)

Actual result
Efficiency 1 Leather Cap is in the chest.

Alternative (from MCPE-167736)
Found Leather tunic with "Efficiency I"
Seed 9052485491962549889
Mansion location approx. 296, -4200

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Original description
My friends and I raided a woodland mansion and one of them actually found a leather helmet with efficiency 1 on it! That shouldn't happen.