Wrong spacing with @B AvantGarde

Hello,

if my personal "doc" file contains  the line:

   @InitialFont	{ AvantGarde Base 10p	} # initial font

and my document has this:

@Doc @Text @Begin

@CD 40p @Font { Tarjetas de Subitización }
@CD @B {{40p} @Font { Tarjetas de Subitización } }
@CD {AvantGarde Demi 40p} @Font { Tarjetas de Subitización }
@CD {Bold 40p} @Font { Tarjetas de Subitización }

@End @Text


the produced output is presented in the image attached.


Using @B and the Bold family messes up inter-word spacing.


Daniel


PS. This reminded me of another unsolved mystery:

https://lists.nongnu.org/archive/html/lout-users/2012-09/msg00004.html