`no active host node: (internal):(-1)` occurs when attempting to observe a node that was passed in via callFunc

[gincwang]

Assuming nodeA has field `field1`, and nodeB has function field `func1`

if we attempt to do this inside nodeB's func1:

' // some other component
nodeB.callFunc("func1", nodeA)

' // nodeB.brs
sub func1(nodeA as object)
    m.nodeA = nodeA
    m.nodeA.observeField("field1", "onField1Changed")       ' this emits "BRIGHTSCRIPT: ERROR: roSGNode.ObserveField: no active host node: (internal):(-1)" error in the log
end func

[gincwang]

Also, same error happens in another scenario: if a node was returned via callFunc, and we try to observe a field on that returned node