My site is using jquery 3.5.1. When a breadcrumb segment is hidden after another one has been hidden, the earlier one's get an inline style applied to them of display: none. When you expand the viewport this inline style is not removed.
After some troubleshooting I realized your demo was using version 1.9.1 and when I replaced 3.5.1 with 1.9.1 this behavior stopped and the segments reappeared as expected.
My site is using jquery 3.5.1. When a breadcrumb segment is hidden after another one has been hidden, the earlier one's get an inline style applied to them of display: none. When you expand the viewport this inline style is not removed.
After some troubleshooting I realized your demo was using version 1.9.1 and when I replaced 3.5.1 with 1.9.1 this behavior stopped and the segments reappeared as expected.