! Bug: file/form=stream doesnt see file in another directory

sp rm -f subdir/a.dat

def ax/x=1:1/np=1 xax
def grid/x=xax g
list/clobber/form=stream/file="a.dat" 1
file/form=stream/grid=g/var=a "a.dat"
list a              

can dat/all
sp mkdir -p subdir
sp mv a.dat subdir
file/form=stream/grid=g/var=a "subdir/a.dat"
list a                     
