Sorry.
Departing from any Indo airport, I mean.
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For Aust dom flights, and Aust dom sec screening, for HLO, they have the propensity to push or move your HLO onto secondary, if they feel something needs to be looked at indepth, and this is where, someone can take your bag, if you are not looking at the system in place.
This is where they ask you to (in MEL) to stand behind the bunging, while they open your bag and look for the sus item.
Sometimes, on rare occasions, even if your HLO goes into secondary, they will let you go without opening and searching.
Probably they get more security fees from your airline fare by the bag going to/into secondary.
With the new system, your view is blocked by the fact you have to stand akimbo, and you might need a patdown, also then giving some people the chance to take your bag, rater in Aust but probably prevalent overseas.
Int into Aust, flights, supposedly, also they (ABF) xrays every incoming hold luggage bags, but this is downstairs, prior to it coming out the chute where bag collection is.
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Youtube/Reddit: "how your checked bags are treated in Indonesia".
Even while removing or putting bags onto the plane, the video shows your bags are already being looked into.
Not by security staff mind you.
Most likely taken by a baggage attendant who has some scruples.