Arcade + Circle + fast Collision = lost velocity? (bounce=1)

[pad]

Hey,

i have a little problem. if i set a ball to "circle" collision. and use setBounce(1); sometimes the ball loss velocity (it slow downs dramatically).

U can reproduce it on:
https://labs.phaser.io/edit.html?src=src/games/breakout/breakout.js&v=3.22.0

Just add 
this.ball.setCircle(10);
between line 33 and 34 an try to hit two ore three bricks in a row.

Anybody an Idea?
Thank u

paD