My understanding and experience has been that as long as the initial upload was via Cloud-based Lightroom, and the folder was synched to LR Classic and remains synched, deleting the photos in the cloud-based version of Lightroom will also delete them locally on my hard drive in LR Classic. For that reason I first disable sync and then delete them in the cloud. But even so I am not experiencing this problem.
I will try to reproduce this with another folder specifically set up for this reason and post my results.
My understanding and experience has been that as long as the initial upload was via Cloud-based Lightroom, and the folder was synched to LR Classic and remains synched, deleting the photos in the cloud-based version of Lightroom will also delete them locally on my hard drive in LR Classic.
By @francoistweet
Your understanding is incorrect. Like I said, they won't be deleted from the Lightroom Classic catalog or from the disk, they will only be removed from all synced collections. Of course this is only if they have been successfully synced before you delete them from the cloud. There is nothing wrong with doing it your way, but it is not necessary.