Manshoon is a good example of casters being unaware of the condition of their clones. Nothing in the Ruins of Zhentil Keep the AD&D 2E sourcebook or Shadows of Doom the novel indicates that Manshoon has any idea if his stasis clones are destroyed. In Ruins of Zhentil Keep the stasis clone spell used by Manshoon is detailed on page 124:
Manshoon's stasis clones are obvious targets for those who wish him
dead, permanently. Several time his enemies or his rivals in the Inner
Circle of the Zhentarim have gone to a great deal of trouble to
kill him and destroy all of his stasis clones, only to find that Manshoon
had squirreled away one or two they had missed.
In Shadows of Doom the activated Manshoon clone is unaware of the status of any other clones, on page 302:
Manshoon strode steadily across the city towards the Tower High.
This long walk in dusty garments meant that his enemies—accursed
Elminster doubtless among them—had won. Again.
The black-robed, dark-eyed Lord Archmage of Zhentil Keep checked
then, half turning to look back. Had there been other bodies—more
waiting Manshoons—lying in the crypt beside him? How many times
had he made this walk?
The description of stasis clone is very close to the 5E clone spell, much closer than the AD&D 1E-2E clone spell. The stasis clone spell takes nearly a full page, and covers many details, including how the caster can update the clones memories, but nothing about what the caster is aware of. Therefore it seems the caster is unaware of what happens to his or her clones once the spell is cast. Despite the age of the sources Manshoon is the best source of information about the clone spell as his source of near immortality is the stasis clone spell.