net.sf.jsqlparser.schema.Column parse unexpected in 5.4

[pugwoo]

example code:

    public static void main(String[] args) {
        net.sf.jsqlparser.schema.Column col = new net.sf.jsqlparser.schema.Column("t1.`id`");
        System.out.println(col);
    }

in version 5.3, it ouputs

t1.`id`

in version 5.4, it outputs

"t1"."`id"

column t1.id is allowed in MySQL:

select t1.`id` from t_student t1 limit 10;

In this case, version 5.3 output is expected