[wheybags] NPE [0.17.64] Biters have blinders

[plepper1]

To Recreate:

Place your first turrets at the choke points near the original base, not near the iron deposits. (This does not trigger the scenario to advance.)
Kill everything in the original base.
Attack the original biter spawner from the first cut scene.
Watch the biters walk past as you're shooting away at the spawners/worms.

Factorio 0.17.64 8_12_2019 2_31_47 AM.png (2.88 MiB) Viewed 1203 times

I saw similar weird biter behavior when taking out the spawner to the east later in the scenario.

Factorio 0.17.64 8_12_2019 11_57_28 PM.png (3.96 MiB) Viewed 1200 times

The biters which would spawn from the spawner located here would pop out, attack me exactly twice, then run south towards the unprotected radar dish before heading NW along that lower wall to be killed by the two pairs of turrets outside the wall.

[wheybags]

The first is exopected behaviour, the biters will not attack you personally until you finish the gun turrets quest.
As for the second, it's not really clear what's happening, or that it is a bug.
Moving to won't fix for now.