groovy magic breaks on plot actions

[scottdraves]

run this cell in a py3 notebook:

%%groovy
def random = new Random()
def p = new Plot(showLegend: true, useToolTip: false);
p << new Line(x: [1, 2, 3], y: [2, 3, 4], width: 10, displayName: "line 1")
         .onClick({info -> info.graphics.displayName = "new name"})

p << new Line(x: [1, 2, 3], y: [5, 6, 7,], width: 10, displayName: "line 2")
         .onClick({info -> info.graphics.y[1] = random.nextInt(10)})

groovy starts & the plot appears. good.

click on a line.

expected: the line moves. current: nothing on screen, but on the terminal it says:

[IPKernelApp] WARNING | No such comm: e58b2c6e-80d2-495d-9f25-c051f832de5e