[Backport queued_ltr_backports] Fix duplicate layer using the shared pointer and do not update feature count #61482
+58
−1
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Manual Backport of #61444
The implementation on QgsPostgresSharedData (change on the mutex (to mutable) and the clone function) have to be made in the qgspostgresprovider-files instead of the utils (since they are only introduced to 3.42).