Iron golems do not spawn when made by yourself

The block under the left iron block and the right iron block must be air.

And the pumpkin should only be placed at last.

This report is invalid as your game was modified when experiencing this issue. In the environment field you've provided, you mentioned you were using modifications and the bug tracker only handles reports that can be reproduced in a vanilla environment. If the problem persists without the use of mods, feel free to create a new report. Additionally, please see the Bug Tracker Guidelines for the minimum standards when submitting a ticket.

Dupe of MC-60792