[BUGFIX] Re-add two @return $this annotations

This is a regression bug introduced with commit
84b06e7e123 which solves #58256.

At the moment unit tests are red.

Resolves: #58304
Releases: 6.2
Change-Id: Ibe10365a5f1232cc58fc6e4a56a2d915c9ac43f8
Reviewed-on: https://review.typo3.org/29720
Reviewed-by: Oliver Klee
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen