Vscode: Watch pane does not use evaluateName when executing "Copy Value"

I've had a bug raised where values copied (using Copy Value) from the Watch pane are truncated. I investigated, and it seems like there is a difference in behaviour between the Variables and Watch panes. I'm examining an array with a single long string in it:

In both the scopesRequest and the evaluateRequest I return a variablesReference for the array. In the variablesRequest they both return the same data, which is the following (an array of Variable):

[
    {
        "evaluateName": "longStrings[0]",
        "indexedVariables": null,
        "name": "[0]",
        "type": "String (_OneByteString)",
        "value": "\"This is a long string that is 300 characters! This is a long string that is 300 characters! This is a long string that is 300 ch…\"",
        "variablesReference": 0
    }
]

This has a truncated string for display, and an evaluateName that will give the full string. However it seems that when I chooseCopy Value from the Variables window the expression gets evaluated, but choosing Copy Value from the Watch window just copies the truncated value into the clipboard.

(@isidorn does this seem like a bug, or are they intended to work differently?)