I have found that select element have duplicate name attribute "field_perspec...

Contribution Date
Technology
Drupal
Contribution Project
Improved Multi Select
Contribution Details

I have found that select element have duplicate name attribute "field_perspective_category[]" so i convert one that have id "#edit-field-perspective-category-cloned" to "edit-field-perspective-category-cloned[]"

Attached patch file works for me with Improved Multi Select version 8.x-1.3

Contribution Author
uditrawat
Contribution Issue Link
Can't deselect selected option after form submit
Contribution Link
https://www.drupal.org/project/improved_multi_select/issues/2927399#comment-123…
Files count
2
Patches count
1