[2.0.21] Damage to space platform from asteroid chunks

[Fireisdanger]

What did you do?
I was flying a platform from Aquilo to the edge of the system and noticed a surprising amount of replacement part usage.

What happened?
On close observation I noticed what appeared to be oxide asteroid chunks impacting the platform and destroying turrets. I am fairly certain they were chunks rather than small asteroids because they were not engaged by any platform defenses despite capacity and they did not pop up as anything upon mouseover. If I quickly remove target prioritization from some turrets they will not engage the debris. In the save file SA1.61 a big oxide asteroid on the front center right side of the platform is just outside engagement range of rocket turrets upon loading. The big asteroid is engaged by rockets about 5 seconds into save, and then shortly thereafter by guns and lasers. The chunk debris from the impact strikes the platform at 10-11 seconds in and destroys an uncommon and a rare turret on the rightmost forward extension on the platform.

What did you expect to happen instead? It might be obvious to you, but do it anyway!
I was under the impression that chunks should not cause damage upon impact, so the result is surprising.

Does it happen always, once, or sometimes?
The behavior is deterministic in the attached save file

[Theragus]

Hi, looking at your save file, the damage to your turret is not due to asteroid chunks but due to the railgun firing right behind the turrets.
Railguns will damage everything, even your own buildings in its line of fire, so its recommended to place them where their line of fire does not cross any buildings.
Not a bug.

[Fireisdanger]

That makes much more sense. Thank you!