[0.17.79] Friendly biter

[kmddm]

Factorio Version: 0.17.79
MacOS: 10.14.6

Biters becomes friendly, then stucks in loop for about 5-10 seconds, then dies.
Happens only on one specific biter path(red arrow on the screenshot).

See attached screenshot.
If you need save file - please reply.

[posila]

Thanks for the report.
I don't know why this happened, but Introduction scenario has been replaced by updated campaing levels, so we won't investigate this anymore.