Regression: output from LyX 2.4.0 RC3 won't compile (worked with LyX 2.3.7)

[Philipp Klaus Krause]

Hello,

the Small Device C Compiler (SDCC) uses LyX for its manual. This worked
for me up to LyX 2.3.7. Now, that LyX 2.4.0 RC3 is in Debian testing, I
can no longer compile the manual:

Overfull \hbox (115.3143pt too wide) in paragraph at lines 7427--7429
[][][][][][]|
(./sdccman-1.cpt)
! Missing } inserted.
<inserted text>
                 }
l.7432 \hline

?
! Extra }, or forgotten \endgroup.
<inserted text> }

l.7432 \hline

The corresponding SDCC bug report is:
https://sourceforge.net/p/sdcc/bugs/3708/
The source files can be found at:
https://sourceforge.net/p/sdcc/code/14546/tree/trunk/sdcc/doc/

Philipp