I dont know if this is specific to the new Beta, but when I am bulk-editing custom properties on my connections it will remove any custom property already in place at a connection.
It should not overwrite the whole custom properties of a connection but add the new ones to it, am I right?
Allright, thanks for clarification
this is actually by design. The custom properties are actually stored (encoded) in one data property, that's why it's not possible to make bulk-changes without losing previous properties.
For V5 we have some improvements around the PowerShell cmdlets on the roadmap which will improve script based access to custom properties.