A: Partially. The film explores the "factory defect" concept. For the full backstory of the ear, watch Doraemon: Stand by Me (2014), but this film offers a unique parallel narrative.
The story begins when a mysterious thief known as steals the gold bell from Doraemon’s neck while he is sleeping. Without the bell, Doraemon begins to act more like a stray cat, losing his composure. To find the bell, Doraemon gives Nobita a "Sherlock Holmes" gadget set, which leads them to the Museum of Future Gadgets in the 22nd century. doraemon movie nobitas secret gadget museum