#4690 No autoBeaming done for two quavers followed by a manual bar

[Simon Albrecht]

The following should give identical beaming in both measures:

\version "2.19.32"
{
  \time 3/4
  %\set Timing.beamExceptions = #'()
  8-"default" 8  16 16 16 16  8 8
  8-"with bars" 8 \bar "" 16 16 16 16 \bar "" 8 8
}

However, it doesn’t – see attached image.
Clearing beamExceptions makes the problem go away.