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Summary
SUMMARY: Bugfixes "Fixes loading worlds with old megastores"
Purpose of change
Fixes #34860 - Added save migration code for old megastore specials which was missing from #34625.
Updated alt map keys to reflect the new ids.Describe the solution
Because megastores are 3x3 with some strange OM symmetry but not tile specific symmetry, each cardinal orientation needed to be tested for before the appropriate replacement code could be executed.
Describe alternatives you've considered
Leave old saves broken.
Adjust the "nearby" conversion code to allow for more complex adjacency checks
Testing
Loaded one of my old worlds and teleported to three different megastores. Each loaded with the correct orientation without any problems.