I could not reproducce your issue per my test.
Users who have full control permission are able to re-approve items and see pending status of modified items.
Usually, when an item is in Pending status, the item originator and the people who have permissions to manage lists and libraries can see it.
Please remove affected user permissions at _layouts/15/user.aspx
page, then remove them from the UserInfo list at /_layouts/15/people.aspx?MembershipGroupId=0
page, clear browser cache, after that, grant permissions again to compare the result.
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