I tried it in a clean boot of Fossapup64 9.5, fully updated using Quickpet->Info->Fossapup updates
A fresh new save folder, with basic settings and config changes.
Installed clonezilla_3.35.2-1 offered in PPM.
Yes it is the basic clonezilla.
It works OK for me and had no problems with the save or rebooting using the save.
It probably replaced something, over wrote something, added something, etc... by doing the install, into your old save.
This conflicted with something, already in the save.
This is one issue, with PPM in Fossapup64 9.5, downloading stuff from a Ubuntu Fossa focal repository.
The download, may also, install something that conflicts, with something already in the save.
Welcome to Linux software.
Using the clonzilla.iso, to make a clonzilla Live CD or USB, is always the best way to use it.