Updated Rustic to 1.0.14 and a crash happened where it is referencing Dynamic Trees class files. I don't have the mod installed and I understand it is supposed to be a soft dependency or is that changing?

Crash report: https://paste.ee/p/JLy9z

Can concur, I have the same crash. I assume it's just something that was made in error:
https://hastebin.com/vonixufadi.sql

This behavior is unintentional. Fortunately the Rustic 1.0.14 update was solely for compatibility with the new Dynamic Trees and contains no other enhancements. So if you don't use DT then simply downgrade Rustic to 1.0.13 until we get it sorted out. For you there's no difference.

Please remove the hard dependency on Dynamic trees...causes all sorts of confusion.

I can't remove it from an already posted version. Just downgrade until the next version.

Fixed in 1.0.15