Get_Ctx_Values___ doesn't return any value

Problem

There is a customer, who is in 22R2 SU4. Their reported issue appear due to not returning any value from the following method call.

BEGIN
   -- Call the function
   :RESULT := DOMAIN_SYS.Get_Translated_Values(domain_ => :domain_, lang_code_ => :lang_code_);
END;
 

Following is the Get_Translated_Values method content.

Both methods return, null. 

According to the following Get_Ctx_Values__ method, context_value_ variable always returns null in customer environment.

domain_ is ‘WorkTypeCategory’

value is ‘gb’

Following values are available in customer environment.

So, my question is, can anyone please let me know, what could be other reasons for not returning any values for , 

context_value_ := Sys_Context(context_, nvl(value_, 'PROG'), ctx_length_);

In 22R2 core environment following records were returned any issue.