Non fully uppercase Test Status names don't work on JQL issue search

TestRunStatus custom field JQL search doesn't work for non-fully uppercase Test Statuses:

Steps to reproduce
1 - Create a Test Status called PascalCase
2 - Execute a Test to status PascalCase
3 - Search issue with expression "testrunstatus = PascalCase"

Expected result

When searching tests by TestRunStatus, all uppercase and lowercase variations like "PASCALCASE", "pascalcase", "PaScAlCaSe" should return values. 

https://docs.getxray.app/display/XRAY/Enhanced+querying+with+JQL#EnhancedqueryingwithJQL-CustomFields

Workaround
Change the Test Status Name to fully uppercase letters.