I don't think it's a bug. It's a snippet from the official documentation.Look 
at the first snippet in the following page, there's a collision as well:
LilyPond Learning Manual: 4.6.3 Real music example

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LilyPond Learning Manual: 4.6.3 Real music example

LilyPond Learning Manual: 4.6.3 Real music example
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A function that helps in discovering these things would be really useful...
    Il venerdì 15 novembre 2019, 11:01:14 CET, Malte Meyn 
<lilyp...@maltemeyn.de> ha scritto:  
 
 

Am 15.11.19 um 01:50 schrieb Paolo Prete:
> 
> I think that a very useful function would be a way to highlight or 
> change the color for all the objects that are causing a collision.
> Is there already some code for that?
> Look for example at the two slurs in the following snippet:
> 
> […]
> 
> When there are many and many graphic objects on a score, it's easy to 
> ignore some of these errors relying on observation only...

If LilyPond knew that there was a collision it wouldn’t engrave it that 
way so IMO that’s a bug. Without knowing about a collision LilyPond 
cannot tell you about it ;)

  

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