Test suite failure in `tst/manual.tst:180`: "Error, This is not a rack"

This fails across all GAP versions tested by CI:
```
########> Diff in /tmp/gaproot/pkg/rig//tst/manual.tst:180
# Input is:
Rack(set) = Rack(SymmetricGroup(3), (1,2));
# Expected output:
true
# But found:
Error, This is not a rack
########
```
