BUGs in SQL Developer (since version 19 and persisting into v24.3.1) with TRAILING SPACES / BLANKS
FYI for everybody using SQL Developer, in the SQL Worksheet where you submit queries or DML or DDL statements against your current database connection:
BUG #1: If you try to execute a single DESCRIBE statement for any owner.object, with one or more TRAILING BLANKS (SPACES) AFTER the object name, you will get an ORA-04043 "object does not exist" error. If you REMOVE ALL TRAILING BLANKS (SPACES) after the object-name, the DESCRIBE statement will describe that object correctly WITHOUT error (as long as the object actually does exist).
Test case: "DESCRIBE SCOTT.EMP " — without the quotes, but WITH one or more TRAILING BLANKS.