jshell> Bidi.requiresBidi("AAAAAAAAA".toCharArray(), 2,20)
| Exception java.lang.IllegalArgumentException: Value start 2 is out of range 0 to 20
| at BidiBase.requiresBidi (BidiBase.java:4543)
| at Bidi.requiresBidi (Bidi.java:304)
| at (#2:1)

The emitted statement "Value start 2 is out of range 0 to 20" is false.
The exception message is created here [1] and is based on more than the simple size check. This leads to the incorrect message.

4542 if (0 > start || start > limit || limit > text.length) {
4543 throw new IllegalArgumentException("Value start " + start +
4544 " is out of range 0 to " + limit);
4545 }

[1] https://java.se.oracle.com/source/xref/jdk-jdk/open/src/java.base/share/classes/jdk/internal/icu/text/BidiBase.java#4542