Exiting a stacked BT may cause premature completion

[eelstork]

In a typical case you create a BT (say 'A') with its agent set to loop = false.
Then you stack another BT (say 'B')
When B returns done, the agent will disable. However continuation is expected until the root BT has returned done.

Tried patching this in UGigAdapter. Works, mostly; however this is hackish and does not resolve the actual issue.

[eelstork]

The patch I've been using is an actual fix; will push.