Help Please - In game trees vanishing (long horned beetle not suspected)

[mitch]

Hello Helpers,
I've run into a peculiar glitch as of late. You'll see in the first picture a densely grown forest (one of CPT Godmode treecontrollers). However, as soon as I run the game for exactly 1 month, some of the trees just "disappear". I've played around with different graphics settings etc and the only other "symptoms" I've found were these;
1) if I 'start a new city' the  trees do NOT disappear.
2) if I replant the trees (in god mode again), they will again disappear a month later 
Game is a fresh (steam) install, fresh region, organized plugins with OP terrain mod without any other conflicts noted.

Any thoughts?

Cheers,
Mitch

[c.p.]

Some of the douglas firs and ponderosa pines are "clearcut" at regular intervals in some of those tree controllers.  Generally there will be stumps, etc left behind, in that case.  So that is one possibile answer.  But it's hard to tell what's going on at that zoom level.

[mitch]

I suspect that is probably what is happening. It only seems to happen once, I haven't noticed if it repeats itself until all the trees are effectively "logged".
Thanks for the insight and for your great work. I really enjoy a good evergreen forest around my cities.

Cheers,
Mitch