Sort by Rollup doesn't work when Roll Up has 'Unique Values' specified

[Infiniverse]

Describe the bug Add a roll up field to a table. Sort by the roll up.

Observe that the table is sorted by the value in the Rollup property.

Edit the roll-up property and specify that only unique values should be selected.

Observe that table is no longer sorting on the value of the Rollup property.