[Bug] canBuildAST in BracketPairsTextModelPart affect language configuration

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

I implement a custom language syntax support in vscode extension, which includes syntax highlight and language configuration feature. They works totally fine in vscode and vscode.dev.

When I try to implement it in monaco-editor with vscode-textmate, the syntax highlight works fine and language configuration setting does not work at all. After spending a day debugging, I find the class BracketPairsTextModelPart in esm/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsImpl.js might have some problems:

In contrary to monaco-editor(v0.21.2), monaco-editor(v0.52.2) adds a getter canBuildAST in class BracketPairsTextModelPart. As long as canBuildAST returns true, functions like matchBracket always return null because of new implementation branch(I need to debug deeper to find out why it returns null), while the old one works just fine for my language configuration setting

two branches that depend on canBuildAST

brackets match (I force canBuildAST to return false and the old branch runs)

brackets no match (I force canBuildAST to return true and the new branch runs , which is the bug)

Monaco Editor Playground Code

Reproduction Steps

No response

Actual (Problematic) Behavior

No response

Expected Behavior

No response

Additional Context

No response

Start with esm/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsImpl.js, focusing on BracketPairsTextModelPart.canBuildAST and the matchBracket branches it selects. Reconstruct the custom-language case described in the issue, since no playground code or reproduction steps are provided. Done means language configuration and bracket matching work for that case without forcing canBuildAST.