Tag alias field is being autopopulated with a date instead of a string of text

Is there a setting to change the Tag alias to default to a string of text.

I just created a test Tag and the Tag alias field auto-populated with the following:

2016-01-13-17-01-43

I was expecting it to auto-populate with

this-is-a-test-tag

Please let me know if this is a bug, a feature, or a configuration issue.

The older version always auto-populated with a string of text.

Sean