If a Room Block was synced to Mews as Definite, then changed to status Lost, it is not cancelling the reservations made in Mews.
The rooms will remain as confirmed in Mews, which then syncs back as Definite in Event Temple.
This is due to the settings when confirming changing the block status to Lost - currently there isn't the option to also cancel the reservations.
When changing the whole Booking status to Lost, there is the option to cancel the reservations.
✨We will be adding the functionality to cancel reservations when changing just the Room Block status to Lost. Coming soon!