If you also use the official original technology tree blueprint in the plugin, you will not be able to unlock the technology tree

If the custom technology tree in the plugin also uses the official original technology tree blueprint, the technology tree will not be unlocked, and in principle, he can't change the official technology tree to reorder, right?

If you learn about a blueprint from the research table or the official techtree, the item will be unlocked in the plugin tree. The bps check is performed in the background so as not to affect the opening of the display.
A blueprint learned by the research table will be directly taken into account. A blueprint learned by the official techtree will have to be verified when the display is opened.

I guess he could replace the official tech tree and change the default tech tree location, but he couldn't unlock the blueprint directly...

The blueprint can be learned from the official tree, the research table and the custom techtree. But it must be an item and not a url.

"Name": "A1",
      "Parent": "",
      "Image URL or Item": {
        "Type": "Item",
        "Value": {
          "Item ID": 1608640313,
          "Skin ID": 0
        }
      },

I don't understand your problem, I think it's just a matter of understanding the configuration. 

The configuration is as follows, the plugin loads normally, but even if you have enough resources, you can't unlock this project

Then, at the same time, this is the first item of the Level 1 Workbench, and when this plugin is loaded, the official original tech tree cannot be unlocked

A first node has no parent, as in my example, so if you can't unlock it, either you don't have the resources, or the branch before this node contains a node that hasn't been unlocked.

Refer to the configuration generated when the plugin is launched

It's not possible for my plugin to interfere with the official techtree, I'm not modifying anything in the basic game.

Changed Status from Pending to Not a Bug

Do we have to start from A1 as the node

The node name is its ID. You don't have to call it A1, you can use anything like the item name as the ID. This is your own logic.
If you want to start a tree, you don't specify a parent, otherwise you specify a parent (ID).

I'll go back and add a few more blueprints and try again

Have you managed to create a configuration for yourself ?

So far, I haven't used this plugin and am currently using the official one