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A previous change got parts[next_index] and parts[part_index] confused, this corrects that.
Summary
SUMMARY: None
Purpose of change
This corrects a logic error introduced by #26477
The expected symptom is that opening or closing multitile doors will fail to propagate to adjacent door pieces.
Describe the solution
Extract the part coordinate for comparison purposes instead of accidentally subtracting it from itself.
Describe alternatives you've considered
The whole function needs cleaning up, but I don't have time for that at the moment.