Hierarchical Tree of Hierarchical Taxonomies is wrong after save in the Meta Box

[anonymized_14808221]

1. Install WordPress

2. Create some Terms in the native Categories:

- Parent Term
-- Child of Parent Term
-- Child-two of Parent Term

3. Save a Post with:

- Parent Term
-- Child of Parent Term

See that the order of the Checkboxes is wrong after save:

-- Child-two of Parent Term

should be listed below

- Parent Term

even if unchecked

[anonymized_14808221]

After saving the Post the unchecked Child term is out of order

[anonymized_14808221]

Before save the post, the order is correct

[knutsp]

Quoting @SergeyBiryukov from #30721

Duplicate of #10982, #14723, #14916, #16475, #17135, #17317, #17835, #19880, #20160, #21544, #21127, #29871.

This is intentional, see #10982. A filter was introduced in #20054, allowing plugins to change that behaviour.

This plugin implements the change: ​https://wordpress.org/plugins/category-checklist-tree/.