TIMESTAMP and QUALITY in QualifiedValue is undefined - perspective-client

Module Development
1

@inductiveautomation/perspective-client": "^2.1.16

When accessing the object returned by PropertyTree.readQualified(), the QUALITY and TIMESTAMP are undefined. I can only read the QUALITY and TIMESTAMP by "_$QUALITY$_" and "_$TIMESTAMP$_".

const qv = tree.readQualified("path");
qv.QUALITY  // undefined
qv.TIMESTAMP // undefined
qv._$QUALITY$_ // {code: 0, diagnosticMessage: ''}
qv._$TIMESTAMP$_ // Tue Sep 19 2023 15:29:32 GMT+1200 (New Zealand Standard Time)

This doesn't match the type definition in QualifiedValue.d.ts