[Vanilla Bug] Spread=0 still causes some spread damage

[Bittah]

First Check

• [X] I added a very descriptive title to this issue.
• [X] I used the GitHub search to find a similar issue and didn't find it.
• [X] I have attached as much information as possible (screenshots, debug and exception logs, etc).

Description

Precision weapons with Spread=0 on their warhead will still cause damage to infantry that are standing on a different sub-cell of the same cell as the target. It's not uncommon to for example see a sniper kill 2 or 3 infantry at the same time if their health is low.

Required Code (optional)

No response

Steps To Reproduce

Place 3 infantry on the same cell and then make Umagon fire her sniper at one of them.

Expected Behaviour

Only the targeted infantry dies and the other two don't receive any damage.

Actual Behaviour

The targeted infantry dies and the other two infantry receive a small amount of damage.

Additional Context

No response