"Bug" in Syntax Error reporting in Google Chrome

reproduction.js

/**
 * If I run it in Google Chrome Version 131.0.6778.205 (Official Build) (64-bit), it gives the following (unexpected) error:
 * Uncaught SyntaxError: Private field '#C' must be declared in an enclosing class
 * If I run it in Mozilla Firefox or Node.JS or online JS compilers, they all give (expected) error:
 * SyntaxError: Identifier 'arg' has already been declared
 */

class Example {
    A() {
        this.#C()
    }

    B(arg) {
        let arg
    }

    #C() {
    }
}