Hello,
I've recently converted to GrapheneOS and seem to have found a bug in the Private Space implementation. The option to hide the space is there, however when you turn that on to launch/unlock the space you are supposed to search for Private space in the apps and it will then show up for unlocking.
However on this OS this search does not bring up the space at all so the Private space is no longer that private as the only way to use it is to leave it unbidden.