The block editor is restoring back the title that was last saved (or typed manually into the textarea), so with the block editor, you can change the title dynamically using this code:
wp.data.dispatch( 'core/editor' ).editPost( { title: 'Title here' } )
PS: You should make sure your JS file has the wp-editor, wp-edit-post or wp-data as part of the dependencies.
UPDATE
Here are the resources which helped me identify the above solution/code:
-
https://developer.wordpress.org/block-editor/packages/packages-data/#dispatch
-
https://riad.blog/2018/06/07/efficient-client-data-management-for-wordpress-plugins
-
https://github.com/WordPress/gutenberg/blob/master/packages/editor/src/components/post-title/index.js (the React component which setups the title textarea / UI)
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