Collapsible Panel as first field won't collapse

[ekateiva]

• Laravel Version: 11.30.0
• Nova Version: v4.35.4
• PHP Version: 8.3.9
• Database Driver & Version: MySQL
• Operating System and Version: macOS 14.4
• Browser type and version: Chrome 130.0.6723.92
• Reproduction Repository: N/a

Description:

When you define a Panel::make(...)->collapsable() as the first fields() element, it is not collapsable and the arrow is not even seen.

Detailed steps to reproduce the issue on a fresh Nova installation:

public function fields(NovaRequest $request)
{
        return [
            Panel::make('First Panel', [
                // Fields
            ])
            ->collapsable(),
            // ...
            // Other fields
        ];
}

Related issue

#4749