OpenType 'frac' feature affects all numerals, not just fractions

[uRohan]

JetBrains Mono version

2.304

Software

Visual Studio Code 1.87.2
Visual Studio Code - Insiders 1.88.0-insider

Visual Studio Code settings

{
    "breadcrumbs.enabled": false,
    "editor.fontFamily": "JetBrains Mono",
    // Fractions: 1/3, 2/3, 3/3, 4/3, 5/3.
    "editor.fontLigatures": "'zero', 'frac'",
    "editor.fontSize": 13,
    "window.titleBarStyle": "custom",
    "workbench.colorTheme": "Default Light Modern",
}

Here's what it looks like

Before	After

[heddxh]

Same here, also in kitty, Arch linux