Summary

When working with the single line text field, you can easily perform a search agains the issue. However the issue will populate in JQL searches for whatever data the field contained prior to being re-set to EMPTY.
JQL will still filter the issue by the "IS EMPTY" JQL search criterion, however it does show up in a search if it matched previously.

Environment

Cloud

Steps to Reproduce

• Create a single-line text custom field.
• ensure that you can easily modify the field on some issues
• on a new issue, populate the new field
• Search using TEXT LIKE operator (~) for what you populated in that field, the issue should show up
• Remove the content in the field from the issue
• Search again

Expected Results

The search will no longer populate with the issue.

Actual Results

The issue will show up in the search results in spite of being Null/EMPTY

Notes

none

Workaround

Only workaround known is to filter out by adding "AND CUSTOM_FIELD NOT EMPTY" to your JQL search.