Unable to enter data in a column of a table with a mixed upper and lower case name (4236583)

It's not possible to enter data in a column of a table with a mixed upper and lower case name:

Steps to replicate:
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1.
CREATE TABLE user.test1
(rwfield VARCHAR2(20), "ReadOnlyField" VARCHAR2(12 BYTE))
/

2. Open the table by pressing Ctrl + E. In the datagrid, editing any data in the field "ReadOnlyField" is impossible.

3. If the table consists only of upper and lower case letters, adding / deleting rows is not possible.
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WORKAROUND:
None.

STATUS:
Waiting for fix in a future release of SQL Navigator for Oracle