apache lang3:3.9 RandomStringUtils strange behaviour with regex

Question

I got strange behaviour from apache.commons.lang3:3.9 (but everything is ok in 3.5).

I use RandomStringUtils.random to generate string with length 350. And it matches regex (that has 300 limit).

I can't see any special symbols generated in this string. And string.length() is 350.

public class RegexCheck {
    private String VALUE_REGEXP = "^.{1,300}$";
    private String value= RandomStringUtils.random(350);

    public void run(){
        System.out.println(value);
        System.out.println("string length is " + value.length());
        if(value.matches(VALUE_REGEXP)){
            System.out.println(">>>>>>>>match");
        }else{
            System.out.println(">>>>>>>>don't match");
        }
    }
}

CodePoints in value:

for lang3:3.9: codePointCount is 197. for lang3:3.5: codePointCount is 293. This values may vary from run-to-run.