Space is not freed in ONTAP

Volumes do not reclaim freed space, which can lead to space issues such as full volumes and/or aggregates.
To confirm, run the following command several times over the span of a few hours:

Cluster01::> volume show-footprint -aggregate * -delayed-free-footprint-percent >2

The relevant scanner should run once the footprint percent exceeds 2. If the same volumes are shown and the percentage does not decrease, then the volume is experiencing the issue.
Note: this issue only affects a limited number of releases of ONTAP 9.5