NullPointerException in ZonedDateTime.parse after tzdata-2020a update

Issue

• After updating to tzdata-2020a-1.el7.noarch we're seeing NullPointerException issues when parsing dates.

In jshell:

1. import java.time.*;
2. import java.time.format.*;
3. ZonedDateTime.parse("20170505T173000.000Z", DateTimeFormatter.ofPattern("yyyyMMdd'T'HHmmss'.'SSSz"))

Actual results:

|  Exception java.time.format.DateTimeParseException: Text '20170505T173000.000Z' could not be parsed: null
|        at DateTimeFormatter.createError (DateTimeFormatter.java:2017)
|        at DateTimeFormatter.parse (DateTimeFormatter.java:1952)
|        at ZonedDateTime.parse (ZonedDateTime.java:598)
|        at (#3:1)
|  Caused by: java.lang.NullPointerException
|        at DateTimeFormatterBuilder$PrefixTree.prefixLength (DateTimeFormatterBuilder.java:4527)
|        at DateTimeFormatterBuilder$PrefixTree.add0 (DateTimeFormatterBuilder.java:4396)
|        at DateTimeFormatterBuilder$PrefixTree.add (DateTimeFormatterBuilder.java:4391)
|        at DateTimeFormatterBuilder$ZoneTextPrinterParser.getTree (DateTimeFormatterBuilder.java:4138)
|        at DateTimeFormatterBuilder$ZoneIdPrinterParser.parse (DateTimeFormatterBuilder.java:4249)
|        at DateTimeFormatterBuilder$CompositePrinterParser.parse (DateTimeFormatterBuilder.java:2370)
|        at DateTimeFormatter.parseUnresolved0 (DateTimeFormatter.java:2107)
|        at DateTimeFormatter.parseResolved0 (DateTimeFormatter.java:203