[Bug]: Bouncing Snowballs bouncing to each other

[DiegoEnmanuel]

SuperTux Version

v0.6.3- 1170-g03d9a6506

System Information

Windows 10 64-bit

Expected Behavior

The bouncing snowballs to bounce to each other and then turn around.

Actual Behavior

The bouncing snowballs started to bounce facing the other, with no one advancing.

Steps To Reproduce Actual Behavior

1. Start the level "Out in the Crystal Fields" in the level editor.
2. Go to the first Bonus Blocks in the level.
3. Wait for the Bouncing Snowballs to bounce to each other. Two of them may get stuck bouncing to each other.

https://github.com/SuperTux/supertux/assets/165951053/0974e4dd-afeb-49df-84e6-4debd5790afa

Additional Information

No response

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• [X] I have read https://github.com/SuperTux/supertux/blob/master/CONTRIBUTING.md#bug-reports.
• [X] I have verified this isn't an issue that's already been reported.
• [X] I have verified this isn't a discussion, or an issue about a crash or a feature request, but rather an actual bug ─ that is, the game did something not intended.
• [X] I have verified this issue is not about wrong translations (use Transifex for those), or anything unsupported (e.g. third-party add-ons).
• [X] In this report, I have only included details about one (1) bug.
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