Seems to contain 2.0.16 to 2.0.20 changes.
v2.0.20 only. https://forums.factorio.com/viewtopic.php?f=3&t=121972
Other changes listed in their respective threads.
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Fixed that two damaged construction robots trying to repair each other could get stuck in an infinite loop of trying to hug each other and overshooting.
They were seeking comfort after shared trauma.