I just started a playthrough including both Construction Drones and Tree Growth: Scaled Trees (with its dependencies), and noticed a strange interaction which I verified in a new game where these were the only mods to 0.17.34.
If I deploy the drones and equip the roboport into the armour slot, they will happily chop down trees that I mark with a deconstruction planner. Tree Growth has adjustable settings for distance from a user structure below which trees will be marked for deconstruction, and this occurs within a few dozen ticks of placing things, but the drones ignore the marking. To get the trees cleared, I have to un-mark the trees with Shift-Drag deconstruction, and then swiftly re-mark for deconstruction before the Tree Growth marking can take effect again.
https://imgur.com/LzRqzHx
https://imgur.com/mx2sCTM
It feels as if there are two different kinds of deconstruction marking, and the drones don't understand the one that Tree Growth uses.
More info: if I get construction robots (with Creative mod) then the robots will pick up the auto-marked trees. I've copied this observation to the Tree Growth mod discussion page.

The tree growth will need to raise an event when it marks the trees for deconstruction

No. According to the documentation the event is generated by the game. And I verified, that it is.
https://lua-api.factorio.com/latest/events.html#on_marked_for_deconstruction
However player_index will be nil as there is no associated player. I believe this prevents your event handler from working.

https://github.com/Klonan/Construction_Drones/blob/master/script/construction_drone.lua#L2622
You access event.force, but that is not documented and I could not detect it either.
It would be great if the force were part of the event, since it is part of the corresponding API call. Maybe you should create a feature request?

@Klonan
The bot also didn't deconstruct mining drill that were auto mark by "Auto Deconstruct" mod.