Added safeguard in chunk timing range

[FaroutYLq]

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What does the code in this PR do / what does it improve?

Added safeguard in chunk timing range so we don't explode the last chunk time range.

Can you briefly describe how it works?

Hardcoded: NS_NO_INSTRUCTION_BEFORE_CHUNK_END = 5e7

Can you give a minimal working example (or illustrate with a figure)?

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• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Notes on testing

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