slurring grace to chord: collision

[Malte Meyn]

Hi list,

slurring a grace note to a specific note in a chord gives ugly results. 
The output of the following code is different in 2.19.82 and 
2.19.83/2.21.0 (see attachments) but there are collisions in both cases.

%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.19.82"

\relative {
  \override Slur.color = #red
  \override Slur.layer = 2
  \grace c''8( <b) e,>2
}
%%%%%%%%%%%%%%%%%%%%%%%%%%

Any idea what changed between 2.19.82 and .83?

Cheers,
Malte

2.19.82.png
Description: PNG image

2.19.83.png
Description: PNG image