Add repro for issue #6335.

[tritao]

Closes https://github.com/FuelLabs/sway/issues/6335.

Checklist

• [x] I have linked to any relevant issues.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have updated the documentation where relevant (API docs, the reference, and the Sway book).
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• [x] I have added tests that prove my fix is effective or that my feature works.
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