Selecting label from search box in issue label facet can overwrite selected labels in global search page

Summary

When I selected a label from the search box in the issue label facet, it overwrote the labels that were already selected after clicking apply button.

Steps to reproduce

Please see the screenshot

What is the current bug behavior?

The label selected from the search box in the facet overwrites the already selected labels

What is the expected correct behavior?

The newly selected label should be added to the existing labels

Relevant logs and/or screenshots

label_output

Possible fixes