Bruins fan here. Not sure what to say, although this actually isn't that rare as of late vs. the Canucks. These are Rask's numbers vs. the Canucks since the start of 2017/18:
Feb 18, 2018: 4/8, .500 sv. % (pulled after 20 min, credited with loss)
Nov 8, 2018: 11/14, .786 sv. %, (in relief, played 25:07, credited with loss)
Feb 4, 2020: 25/25, 1.000 sv. % (60 min shutout)
Feb. 22, 2020: 21/27, .778 sv. % (pulled after 46:28, credited with loss)
Total: 1-3-0, .824 sv. %, 5.15 GAA, 1 SO
Don't think you'll find that kind of stat line anywhere else.
Actually Halak is even worse, he's at .796 sv % and 5.38 GAA.
October 20, 2018: 18/20, .909 sv. % (lost in OT)
November 8, 2018: 14/19, .737 sv. % (pulled at 34:53, no result)
February 22, 2020: 5/8, .626 sv. % (in relief, no result)
Combined they've let in 23 goals on 100 shots since the start of 2017/18