in old 11.2u8 we had a home share configured by NOT using the home share check box, instead using a custom name "Privat" as share name and adding "path = /mnt/vol1/Privat/%U" in auxiliary parameters.
after upgrading to 11.3 accessing \\server\Privat now does NOT lead to your personal home directory, instead you see ALL homes. checking with "testparm" reveals the problem, the path parameter as entered in auxiliary parameters apparently gets filtered, the "/%U" is removed and testparm shows the share parameter "path = /mnt/vol1/Privat".
looking at the share configuration in the UI, the parameter was correctly migrated, it is entered correctly with "/%U" but it does not reach the samba daemon/configuration in the system.
on the other hand, if we do use the checkbox "home share" we CAN access the individual home directory using \\server\homes, but it is not possible to supply a custom name for that home share instead of "homes".