To be clear, this is a client-side bug. Could be fixed by using TextExtracts API:

# response from: http://en.wikipedia.org/w/api.php?action=query&prop=extracts&exchars=175&titles=Foobar&explaintext
{
    "query": {
        "pages": {
            "11178": {
                "pageid": 11178,
                "ns": 0,
                "title": "Foobar",
                "extract": "The terms foobar (/\u02c8fu\u02d0b\u0251r/), fubar, or foo, bar, baz and qux (alternatively, quux) and sometimes norf and many others are sometimes used as placeholder names (also referred to..."
            }
        }
    }
}

May want to ping @dr0ptp4kt for context on why certain things are stripped.

Clarification - we should attempt to do this locally with the HTML rather than using an API to get clean text

I don't remember all of the history of this, although I believe the aggressive text filtering was only applied for a default share card (now no longer an option IIRC?), not a user initiated text selection share.

@Fjalapeno I can reproduce the issue with a latest version downloaded from App Store, which is not the case for our develop build. The context menu had been changed, and by clicking neither 'Share...' nor 'Share-a-fact' could I reproduce it.