Strange \key behaviour

[Menu Jacques]

Hello folks,

I typed \key twice inadvertently, as in:

\version "2.19.44"

{
  \key c \major
  \key b \major
  \time 4/4
  \clef "treble"
  gis'2. fis4 gis4 gis4 ais4  | % 2
}

and got the second \key being ignored it seems as a result:

Typing \clef of \time twice in a row doesn’t get such a behaviour, though.

So what do you think?

JM