Sortable Taginput order of tags changes randomly when refocusing after adding tag and dragging it to a different position

[peterarends]

Overview of the problem

Buefy version: 0.8.9
Vuejs version: 2.6.11
OS/Browser: Xubuntu 18.04 / Firefox 72.01

Description

Steps to reproduce

1. Go to https://buefy.org/extensions/sortablejs/
2. Add a tag
3. Change the order of the tags
4. Click somewhere else on the page
5. Click inside the Taginput to refocus

Expected behavior

The order should not change when refocusing.

Actual behavior

The order changes at random when refocusing.

[peterarends]

Removing this line (43) at Taginput.vue:
@focus="onFocus"
fixes the error. But I'm not sure if it has other consequences.