Field names with special characters may not work when querying

Document ID : KB000123454
Last Modified Date : 20/12/2018
Show Technical Document Details
A customer set up a Kanban board with a query on a custom drop down field (ex. named 'CustomText/Field') as follows;

( c_CustomText/Field contains "test" )

However the query is not filtering, no errors are presented.

The problem is the special character '/' in the field name.  Users are advised not to include special characters in field names.  In order for the query to run, remove the '/' from the name in the query as follows;

( c_CustomTextField contains "test" )

The query should work without having to create a new custom field.
Additional Information:
See also: