[WIP] Investigate nullptr issues in Zone and Coord

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

why Zone/coord mostly nullptr? and how does it work actually? are there bugs during process, like miscalculation, or wrong function reference (ex: it's supposed to be Cell2Coord but it's written as Coord2Cell, something like that), array nor pointer issue, etc. do complete analyze and tell me?

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