Percursor Artifact reward

Hi

It seems there is a bug with the reward of the heavily protected percursor artifacts. 

As you see on the image bellow it states there was a vast quantity yet only gives 1 Elerium which is pitiful and to investigate this anomaly lost 12 spaceships. Surely there must be something wrong. 

https://i.imgur.com/6idIN2C.png

Also this is the first time I find something in a protected anomaly. Usually they are completed by another civilization as per notification. 

Please find attached the save file just at the start of the turn before the reward is given. 

https://drive.google.com/file/d/1pxavjnbMCdGADwA93niW87pu4CU0_OlO/view?usp=sharing

 

Thank you.