You can't load split roms and expect it to work (other part won't get loaded), it only works if rom scanner knows about it and this rom is not official = won't be added to rom scanner. (Split expansion roms may be supported in the future)
Because second half of ROM is missing, execution falls off the memory bank which will crash in some situations if "more compatible" is not ticked. (Safety net is not yet good enough)
Merged version of rom will work.
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