icu::DateTimePatternGenerator::createInstance returns U_MISSING_RESOURCE_ERROR when default locale = ROOT and input locale is invalid

Description

Reproduced the issue with ICU 63 and latest ICU codes.

GoogleIssue:129070579

Status

Assignee

Jeff Genovy

Reporter

Victor Chang

Reviewer

None

Time Needed

None

Start date

None

Components

Fix versions

Priority

critical
Configure