Locale information for nb is not working properly

A DESCRIPTION OF THE PROBLEM :
When using the locale 'nb', information like weekdays, monthname etc. is not correct when a locale of 'nn' also has been used first. By not correct I mean they are expressed as some default language eg. english.

I believe that the reason for this bug is a regression for commit https://github.com/openjdk/jdk/commit/f6e54f2f9a27d08b8789244d86354167f1478bb5
Here nb.xml and other files have lost a lot of information. It was deleted in above state commit. Somehow in the language bundle selection there is code that tries to get the correct bundle for a given locale. This ends up in a bad state and english locale data is the result. I believe that the nb.xml should get the data back.


REGRESSION : Last worked in version 14

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
You just need to run some code to reproduce this.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
nn: [, sø., må., ty., on., to., fr., la.]
nb: [, søn., man., tir., ons., tor., fre., lør.]

ACTUAL -
nn: [, sø., må., ty., on., to., fr., la.]
nb: [, Sun, Mon, Tue, Wed, Thu, Fri, Sat]

---------- BEGIN SOURCE ----------
System.out.println("nn: " + Arrays.deepToString(DateFormatSymbols.getInstance(Locale.forLanguageTag("nn")).getShortWeekdays()));
System.out.println("nb: " + Arrays.deepToString(DateFormatSymbols.getInstance(Locale.forLanguageTag("nb")).getShortWeekdays()));
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
No known workaround.

FREQUENCY : always