To add; If it's a private crossing where you don't have to blow the horn, PTC may be starting the crossing sequence on it's own. Some engineers let it finish all the way out, while others nullify the sequence by pressing the button to get it to stop. Not sure how it is on other RRs, but on CSX...PTC blows every dirt road and rabbit crossing automatically. There's even places where there is no crossing, public or private, and PTC starts the horn blasting away.
With the exception of the C40-8s (retired 2016) and the switchers (mostly retired), all the engines with real horn valves got modded to a button in 2009-2010 on CSX. So it's "all or nothing" with the horn.
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