String.replaceAll regular expression behaves differently in Java 11 and Java 8

ADDITIONAL SYSTEM INFORMATION :
Tested on Unix, but shouldn't matter.

A DESCRIPTION OF THE PROBLEM :
Not sure if it's a bug or Java 11 enhancement but repressions in following format give different results in Java 11 and Java 8: "[^x-y&&[^w]]"

For example, following code will generate different results in Java11 and Java 8:
String test1="AcB";
String test2=test1.replaceAll("^A-Z&&[^c]", "x");
//in Java 8, test2="AcB", Java 11, test2="AxB"


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Not sure if it's a bug or Java 11 enhancement but repressions in following format give different results in Java 11 and Java 8: "[^x-y&&[^w]]"


String test1="AcB";
String test2=test1.replaceAll("^A-Z&&[^c]", "x");
//in Java 8, test2="AcB", Java 11, test2="AxB"



FREQUENCY : always