Alt+Q reflow on blank line collapses everything before until the top of the file

[SuzanneSoy]

Using Racket v 6.6.0.5 (20160914-62f5b2c):

#lang scribble/manual

@defproc[(+ [x integer?] [y integer?]) integer?]{
 AAA.}

@defproc[(* [x integer?] [y integer?]) integer?]{

 BBB.}

@defproc[(/ [x integer?] [y integer?]) integer?]{

 CCC.}

Pressing Alt+Q with the cursor on the blank line just above BBB. produces the following result, with all the lines preceeding BBB. concatenated at the top:

#lang scribble/manual  @defproc[(+ [x integer?] [y integer?]) integer?]{  AAA.}  @defproc[(* [x integer?] [y integer?]) integer?]{

 BBB.}

@defproc[(/ [x integer?] [y integer?]) integer?]{

 CCC.}