Enabled but not active… after you did a successful cp, but before you deleted the test copy?
It’s not indicative either way. ZFS blocks (and if they are shared between multiple files) is not known or understood by anything outside of low-level ZFS.
One way to infer is to check with this a few seconds or so after issuing a cp on a large test file:
zpool list -o name,bclonesaved,bcloneused Pool_01
Before you undergo a risky operation:
zpool checkpoint Pool_01
After you’re done and have no need to rewind to a checkpoint:
zpool checkpoint -d Pool_01
I go into more detail in this thread.