I've had this happen with turrets docked to entities not controlled by the player. If I'm in the ship the turrets are docked to I don't seem to have the issue.
Specifics:
Multiplayer server
Turret with slave and effect
Turret with multiple weapons computer setups
Turret docked to power V2 station

Still happens. Also doesn't have to be wedges. These pictures only have normal blocks.
Up close:
https://image.prntscr.com/image/UO7u_LBTRHWnrS9E6yXDQw.png
Far away:
https://image.prntscr.com/image/DQ8HAt8bTtWYnFhJf4BgQg.png

-Confirmed-

removing the active reactor enables the reactor that is left (the yellow one) just fine

no longer an issue i do assume ?

-QA Testing-
Got fixed along the way

-QA TEsting-

How have those mobs been spawned ? from Admin menu or through a command line
What was spawned (if not a normal game asset, could we get the blueprint?)
i have spawned a lot of crap from old power without it beeing going balistic and going hostile. i doubt the spawn itself was the cause.
have those mobs been spwaned into power2.0 before without problems ?

-QA Testing-

-QA Testing-

I've been having this issue on our multiplayer server, LvD. When using a power 1.0 ship with several turrets on it, attacking pirate stations and pirate ships, the select-fire mode is shooting at empty space rather than the intended target. The shots are coming out of the turret at 90 degree angles rather than shooting straight. I have 2 stop turrets on the left and right side of my ship. When attempting to hit a target directly in front of me, the stop turrets point straight at the target, then their 90 degree angle shots hit my own ship and stop me from moving! And all damage turrets miss. So I am unable to do any damage to the target in front of me.

This might be related to an issue on of our moderators reported.

Still happens to cores that existed before the fix (checked in v0.200.334)

Fixed in v0.200.332.

And the crash is back. We have had 7 crashes tonight now.

-QA Testing-

Great info, including stacktrace below and putting in queue:

Caused by destroying the beam computer when its active.

This may have been related to an issue where players in a "build" sector would create a shop and try to sell items to NPC's. These build sectors are about 19 years worth of distance away from the main galaxy. Players in these build sectors have creative mode on. As the trade ships were traveling to the main galaxy, it would crash people's client's when it attempted to draw the trade line across the massive distance.