Found in version 12.1.5 and still in 12.1.6.
in <SEPM>\Inetpub\Reporting\Dashboard\securitystatus.php
line 1626 (12.1.5) or 1610 (12.1.6)
repair the 'from' and 'where' parameters in:
$queryMachinesNotScanned = $queries->getTotalNotScanedQuery($dashboard_sqlwhere_inventory, $dashboardsqlwhere, $millisAgo);
result:
$queryMachinesNotScanned = $queries->getTotalNotScanedQuery($dashboard_sqlfrom_inventory, $dashboard_sqlwhere_inventory, $millisAgo);
The parameters 'from' and 'where' are now consistent with the other function calls.