Value of os.version on macOS Big Sur

ADDITIONAL SYSTEM INFORMATION :
macOS Big Sur
Java all release

A DESCRIPTION OF THE PROBLEM :
System.getProperty("os.version")
Output results:10.16
Target results:11.x

REGRESSION : Last worked in version 15.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
System.out.println( System.getProperty("os.version"));

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
11.x

FREQUENCY : always