This bug is being worked on by the development team and will be fixed in the upcoming release of an update to Village Sim. It seems to happen after there has been a death/burial. A possible workaround is to leave the game after villagers are buried and launch it again. That seems to resolve (at least temporarily, until there are more burials) the situation that causes vanishing villagers, graphic anomalies, etc.
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Barbara
Unicorn
Last Day of Work