It seems that CTM 1.0.1.30 causes an issue with Dynamic Trees (Last updated in Nov 4)

https://pastebin.com/kC5psHJP

Using CTM 1.0.1.29 doesn't have any issues.

They are trying to add to the list returned from getQuads. Good thing I made it immutable or it would have silently trashed my caches. Not a ctm issue.

Yep. You're right. I mistakenly assumed it returned a copy of the list. Thanks.