Puzzled with Yoda triple joins (MariaDB)

[laowantong]

Database Engine MariaDB (and presumably MySQL).

To Reproduce

import pkg from 'node-sql-parser';
const { Parser } = pkg;
const parser = new Parser();

parser.parse("SELECT * FROM A JOIN (B JOIN C USING (x)) USING (y)");

• node-sql-parser: 5.3.9
• node: v18.12.0

Expected behavior
Should not fail to parse.

Additional context

• Some of my students think this is valid SQL, and MySQL agrees.
• Same issue with ON: SELECT * FROM A JOIN (B JOIN C ON B.x = C.x) ON A.y = C.y.
• Obviously works with: SELECT * FROM B JOIN C USING (x) JOIN A USING (y).