version 32-bit v3.1.0 Mac
Steps to reproduce look like this:
Hit hotkey for _Pattern Editor: Selection: Mark Whole Track_on a track with one or more columns, vol/pan/delay/fx visible, and no track fx column.
Mark all elements in the track.
Marks all elements in the track except for the rightmost pan/delay/fx columns.
When a track fx column is enabled/visible, all elements are selected.