[GS] Jebel Barkal produces no iron

In my case, Jebel Barkal provides +6 iron per turn, instead of +4 as expected.
Not sure whether this is due to quick speed scaling or bug.
Save file is attached.
This is just one turn before the completion of Jebel Barkal.
You can see the iron yield goes from 2 to 8.
 

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