If you look at the breadcrumb under Bolt V3 the first item is offset from the rest.
I think this in extra.less should take care of it:

.p-breadcrumbs li:first-of-type:before {
    float: left;
    position: relative;
    top: 1px;

I'll look into an official fix for the next release.
This is adjusted in 2.2.14. The line-height doesn't mix well with the size of the icon, causing it to mis-align the first item.

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