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I checked the forum and it is not mentioned anywhere. Violet Carpenter Bee should work on all trees, but from what I ve noticed it does not work with Sycamore (awards 0 points), not sure if it has issues with other trees.

Violet Carpenter Bee not scoring Sycamore Tree is absolutely correct.

Excerpt from the rule book | appendix:

Violet Carpenter Bee (base game, left/right, 4×, cost: 1)
Effect: Whenever the number of trees of a certain species is required, each Violet Carpenter Bee
at a tree of that species increases that number by 1. There are only five cards for which the Violet
Carpenter Bee is relevant at all:

Beech: Beeches do not score points unless you have at least 4 of them. For instance, 3 Beeches
and a Violet Carpenter Bee at one of them count as 4 Beeches. Consequently, the 3 Beeches score
5 points each, for a total of 15 points (see Beech). You do not score 5 points for the Violet Carpenter
Bee, because it is no Beech.

Horse Chestnut: Horse Chestnuts form a set whose value depends on the total number of Horse
Chestnuts in your forest; a Violet Carpenter Bee at a Horse Chestnut increases that value. For
instance, 2 Horse Chestnuts and a Violet Carpenter Bee at each of them score 16 points (because
you count 4 Horse Chestnuts); without the Violet Carpenter Bees, the set would score only 4 points
(see Horse Chestnut).

Linden Trees: Linden Trees score 3 points each (instead of 1 point each) if you have the most;
Violet Carpenter Bees can help you with that.
Example: Anna has 3 Linden Trees, Boris has 2 Linden Trees and Caro 2 Linden Trees with 2 Violet Carpenter Bees
at them. Caro counts 4 Linden Trees and has therefore the most. Consequently, Anna scores 3 points for Linden
Trees, Boris 2 points, and Caro 2x3=6 points. The Violet Carpenter Bees do not score additional points, because
they are no Linden Trees, but they have helped Caro score more points for her Linden Trees.

Great Spotted Woodpecker and Moss: The values of these cards depend on the total number of
trees in your forest; your Violet Carpenter Bees increase that number.

In all other cases, consider this counter example: You have 3 Oaks and a Violet Carpenter Bee at
one of them, and all eight tree species. When it comes to how many Oaks you have, you would count
4 Oaks; regardless, you score only 3×10=30 points for them (see Oak), because the Violet Carpenter
Bee is no Oak.

Points: The Violet Carpenter Bee scores no points.