Found a bug in version 2.1: Heashot's upgraded version was bugged and did not become unrestricted when in top position (and also caused other items to bug out).
The culprit was in the Tags column (P), where:
== 0 && e.getslots()[0] != ~NORMAL~])
should be
== 0 && e.getslots()[0] != ~NORMAL~)
instead.
Amazing mod, thank you.