We have changed the passwords for the SP manage accounts inside our active directory. So I login to the SP server, then i changed the application pool identify passwords accordingly. Then I went to “Central administration >> Security >> General Security >> Configure managed accounts ”, I saw that the “last password change” column was changed accordingly to match today date as follow:-

So I though that I do not need to manually change the manage accounts passwords inside central administration, but when I try viewing the search service's content source I got the following error:-
Sorry, something went wrong Retrieving the COM class factory for component with CLSID {0FF1CE15-0005-0000-0000-000000000000} failed due to the following error: 8007042d The service did not start due to a logon failure. (Exception from HRESULT: 0x8007042D).
So i realize that SP did not get the new password, so I went back to the managed accounts inside CA, I edit it , then I chose to “change password now >> Use existing password” and I entered the new password there as follow:-

so now I can access the search service’s content source.
So can anyone advice on this , I mean do I need to manually changed the SP managed account password , whenever we change their password inside active directory? and why the SP did not change the password accordingly when we changed it on active directory,,, I mean the “last password change” column inside the CA page was changed to today date , but seems the password inside SP did not change ,, or not sure what happened ?.