I cannot get skeleton for year+week and month+week

Description

I'm trying to get pattern for current locale for week + year or full month + week
code like this:
String pattern = DateTimePatternGenerator.getInstance(Locale.US)
.getBestPattern("wwYYYY");
System.out.println(pattern);

or

String pattern = DateTimePatternGenerator.getInstance(Locale.US)
.getBestPattern("MMMMW");
System.out.println(pattern);

as a result I have exception below:

In debugger I checked predefined formats, and for patterns above they looks not correct,
some patterns are string "(table)" instead of valid pattern:

Assignee

Craig Cornelius

Reporter

Mykola Pavluchynskyi

Components

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Reviewer

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Priority

medium

Time Needed

None

Fix versions

Configure