[Opensim-users] region flags status

[ssm2017]

hello
i would like to play with region flags.
i could not find any information on the wiki about it except the console
command to set them.
the "Robust" example files are not documenting all the flags.
i could find all the flags explained in the file :
opensim/OpenSim/Framework/RegionFlags.cs

my goal is to replace some empty sea regions added around another region to
prevent registration on this place.
like on this drawing :)
XXX
XOX
XXX
region X = no region, just a reserved place
region O = normal region

when setting all the X regions with any of "persistent", "lockedout" or
"reservation" flag, the centered O region is still trying to contacting
neighbour regions (the X ones) when avatar is coming etc... and is always
receiving a ConnectFailure (Connection refused).

when another region is trying to connect on the same place, robust is
refusing the attachment and is saying that a "varregion" is already located
on this place.

is it a normal behavior that the regions are still contacted and that
robust is speaking about a varregion or something not updated after the
varregion migration ?
what flags do you recommend to reserve a location ?
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