Disabled fields still visible in "Import Multi-value Custom Data"

Steps:
1. Open /civicrm/import/custom?reset=1 page
2. Go to Administer > Customize Data and Screens > Custom Fields
3. Add Set of Custom Fields.
(Individual - Student, set true for - "Does this Custom Field Set allow multiple records?")
4. Add fields with any values, save all.
5. Disable all fields and created data set
6. Go back to "Import Multi-value Custom Data" page
7. Open drop-down box "Multi-value Custom Data"
ACTUAL RESULT: in the list you can see disabled data set.
EXPECTED RESULT: disabled dataset should not be visible.

Please see attached screenshot.