Problem
Clean Drupal 8.0.x-dev installation.
Steps to reproduce:
- Create content type
- Go to 'Manage fields' page
- In 'Add new field' type a label, then 'edit' machine name and you'll see:
<span dir="ltr">field_[input]</span>‎(see attachment)
-
The same inside 'field edit' screen. Example of image field editing screen.

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Comments
Comment #1
pingwin4egComment #2
pingwin4egComment #3
swentel commentedComment #4
subhojit777Comment #5
subhojit777Was unable to reproduce the problem. May be it was an issue when pingwin4eg has tested it on 8th November, and it has now fixed.
Image settings

Field machine name edit

Text field edit setting

Long text with summary edit setting

Date field setting

Taxonomy term edit setting

Comment #6
pingwin4egI confirm that the problem no more exists in the latest 8.0-dev.