Colorbox destroys Index

[Herbert Voss]

Am 04.07.24 um 16:16 schrieb Andreas Plihal via lyx-users:
> I am writing a KOMA book with an index. However, I have noticed that 
> the index disappears exactly when only one of my numerous color boxes 
> contains even a single keyword. I have made two MWEs: one without a 
> color box and one with a color box. The PDF of the first one has an 
> index, the second one does not.
> Do you have any idea how I could avoid this error?

An index is in _both_ pdf documents

Herbert