Multiple categories are unintentionally checked

[haniwaman]

There is a problem with the ID selector in the category checkbox function.
For example, when a category with ID:2 is selected, ID:20-29 is also selected at the same time.

[To check, please]
1.Open the edit screen of a WordPress post.
2.In the list of categories, check the category with a 1-digit ID
3.Confirm that categories with 2-digit IDs starting with the same number are also selected.

[Probable cause]
The cause may be that 'input[id^="in-" + a + "-" + i + '"]' targets the selector with the first match when retrieving the checked categories in wp-admin/js/post.min.js.
When id="in-category-2-1" is checked for first match, id="in-category-20-1" to id="in-category-29-1" are also selected.

[How to fix]
Instead of 'input[id^="in-' + a + '-' + i + '"]', use 'input[id="in-' + a + '-' + i + '"]' so that only the target category is checked.

[cbravobernal]

Duplicate of #62504.

Thanks for reporting the error!

It has been already reported in https://core.trac.wordpress.org/ticket/62504