Bug: inconsistent behavior with Shift-modified complex modification and sticky modifier keys

[andmis]

Consider the following complex modification:

{
    "description": "bug repro",
    "manipulators": [
        {
            "from": {
                "key_code": "x",
                "modifiers": {
                    "mandatory": [
                        "left_shift"
                    ]
                }
            },
            "to": [
                {
                    "key_code": "y"
                }
            ],
            "type": "basic"
        }
    ]
},

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If I do the following: And press "xxx" while holding down left shift, then I get "Yyy".

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If I do the following: And press "xxx" while holding down left shift, then I get "yyy".

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I believe the second behavior is the "correct" one.

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I am using Karabiner 14.5.0.