### Godot version

v4.1.beta3.mono.official [ada712e06]

### System information

Godot v4.1.beta3.mono - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1660 Ti with Max-Q Design (NVIDIA; 31.0.15.3179) - Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz (12 Threads)

### Issue description

Vertical scrollbar can't be clicked and dragged in exported property dropdown selection. When you hover over a scrollbar it will light up, but can't be clicked and dragged like other scrollbars.

### Steps to reproduce

Export a property that has a lot of options to select like `[Export] Resource resource;`
In the inspector open property selection dropdown then try to click and drag vertical scrollbar.

https://github.com/godotengine/godot/assets/8630984/60d8f85b-c72a-46b9-bcf7-1f28e680111a



### Minimal reproduction project

NA
_THREAD_SAFE_METHOD_
	if (p_icon.is_valid()) {
		ERR_FAIL_COND(p_icon->get_width() <= 0 || p_icon->get_height() <= 0);
		Ref<Image> img = p_icon;
		if (img != icon) {
			img = img->duplicate();
			img->convert(Image::FORMAT_RGBA8);
		}
		int w = img->get_width();
		int h = img->get_height();
		
		int icon_len = 40 + h * w * 4;
		Vector<BYTE> v;
		v.resize(icon_len);
		BYTE *icon_bmp = v.ptrw();
		encode_uint32(40, &icon_bmp[0]);
		encode_uint32(w, &icon_bmp[4]);
		encode_uint32(h * 2, &icon_bmp[8]);
		encode_uint16(1, &icon_bmp[12]);
		encode_uint16(32, &icon_bmp[14]);
		encode_uint32(BI_RGB, &icon_bmp[16]);
		encode_uint32(w * h * 4, &icon_bmp[20]);