People can steal stuff out of people's chests with hoppers

[MauriceAvecWii]

People can still steal stuff out of people's chests with hoppers when you place them below.
Maybe Hoppers should be added like Furnace's and co?

[eclipseisoffline]

Make sure to set the HOPPERS flag of a locked container to false using /htm flag HOPPERS false. To automatically have this flag set to false for locked containers, remove the flag from the defaultFlags key in your htm_config.json file.

If you use Lithium, make sure to add mixin.block.hopper=false to your lithium.properties file.

[Yilmaz4]

Is there a quick way to set this flag for all existing containers in the world?