There is no replacement that has exactly the same features, because that would be identical software
There is no software that is bug/issue free
There are replacements that can do the same tasks and offer advantages over Microsoft Office (LibreOffice, Nextcloud Office, Collabora Office, Softmaker Office). Their main issue is that they aren’t what everyone uses.
The other issue is that Microsoft Office itself respects neither the open document standard, nor their own published standard for the .docx format, so it’s literally impossible for anyone outside Microsoft to make a 100% compatible program.
There are replacements that can do the same tasks and offer advantages over Microsoft Office (LibreOffice, Nextcloud Office, Collabora Office, Softmaker Office). Their main issue is that they aren’t what everyone uses.
The other issue is that Microsoft Office itself respects neither the open document standard, nor their own published standard for the .docx format, so it’s literally impossible for anyone outside Microsoft to make a 100% compatible program.