Unusual content found (2.4)

[José Matos]

Hello,
  since LyX 2.4 I have been getting this type of warning:

Text.cpp (2126): Handling unknown body token: ` '
unusual contents found:
unusual contents found:
unusual contents found:
Text.cpp (2126): Handling unknown body token: ` '

Or, if I launch lyx from the command line:

Text.cpp (2126): Handling unknown body token: ` '
unusual contents found: [formula equation [grid [row [cell [frac [delim
\Vert  \Vert  [sub [char x mathalpha] [char k mathalpha]][char -
mathalpha][char x mathalpha]] [delim \Vert  \Vert  [sub [char x
mathalpha] [char k mathalpha]]]][macro leq][char c mathalpha][char o
mathalpha][char n mathalpha][char d mathalpha][char ( mathalpha][char A
mathalpha][char ) mathalpha][frac [delim \Vert  \Vert  [char r
mathalpha]] [delim \Vert  \Vert  [char A mathalpha]][delim \Vert  \Vert
[sub [char x mathalpha] [char k mathalpha]]]]]]]] [char   mathalpha]

What is so unusual about this? :-)

Is this something that I should be worried about?

Best regards,
-- 
José Abílio