tooltip.show() doesn't work properly on rotated axis

[netil]

Description

The call of .tooltip.show({x: index}), not work as expected and the index value not showing correctly.
Calling with .tooltip.show({x: 1}) will show the tooltip for index 0, not the index 1.

Steps to check or reproduce

const chart = bb.generate({
	data: {
		columns: [
			["data1", 30, 200, 100, 400, 150, 250],
			["data2", 130, 340, 200, 500, 250, 350]
		],
		type: "line"
	},
	axis: {
		rotated: true
	}
});

// doesn't show any tooltip
chart.tooltip.show({x:0});

// show tooltip, but the tooltip is displaying x:0, not the x:1.
chart.tooltip.show({x:1});