When the user installs as single (skipMap=false) and then navigates back
to choose participant (skipMap=true), the previously-extracted map files
in .mc_custom/saves/ would remain because skipMap=true only skipped the
download. The final participant install state was therefore inconsistent
with the chosen role.
Track the top-level entries that downloadMapZip extracts via a marker
file (.musicquiz-installer-map.json) inside saves/. On participant
install (skipMap=true) or before a re-download, only the entries listed
in the marker are removed, so user-created worlds are preserved.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
claude-bot
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