negative efficiency workers

System Info: Microsoft Windows 10 Pro 64 bit 10.0.16299 compilation 16299 16 gb of ram nvidia gtx 1060 6gb Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 2801 MHz, Cores: 4, Logic Cores: 8

This one is really annoying. Sometimes using work a lot potion a make some workers with negative efficiency. And this is quite a problem because:
- They are preventing the shrines from getting claimed
- they are destroying constructs
- they do it even after load game, the only way is killing them

Note that i destroyed all the workers and make this on fresh ones. Game is after reinstall.

I dont know how exactly reproduce this, but here is the video me making this (and output log)

War For The Overworld 2018.05.24 - 01.12.26_1.mp4
output_log.txt