Makefile considering target remade without running any rules

Question

I was answering another question -- Dependency ordering error for multi-job make on SO, and I posted the following makefile. The OP replied back saying if -j wasn't specified on the command line, it wouldn't build the dir1/out/file.bar target... Perplexed, I verified that it works with -j2 but not with -j1. I've looked it over, and I'm not seeing what I missed. I thought I'd post it here in case someone knows, as I'm very curious...

$(shell mkdir dir1 >& /dev/null; touch dir1/file.foo; \
        mkdir dir2 >& /dev/null; touch dir2/file.foo)


OUTDIRS = dir1/out dir2/out
OUTPUTS = dir1/out/file.bar dir2/out/file.bar

.DEFAULT_GOAL := all

$(OUTPUTS) : | $(OUTDIRS)

$(OUTDIRS) :
        @echo "making $@"
        sleep 1
        mkdir -p $@
        @echo "done making $@"


%.bar : ../%.foo
        @echo "copying $< to $@"
        @cp $< $@

all : outputs
        @echo "done $@"

outputs : $(OUTPUTS)
        @echo "created all output files"

clean :
        @rm -rf dir1 dir2

I am running make 3.81, and OP was using 3.82. I tried running with make -d -j1 -r, and I get the following snippet:

     Finished prerequisites of target file `dir1/out/file.bar'.
    Must remake target `dir1/out/file.bar'.
    Successfully remade target file `dir1/out/file.bar'.
    Considering target file `dir2/out/file.bar'.
     File `dir2/out/file.bar' does not exist.
      Considering target file `dir2/out/../file.foo'.
       Finished prerequisites of target file `dir2/out/../file.foo'.
      No need to remake target `dir2/out/../file.foo'.
      Pruning file `dir1/out'.
      Pruning file `dir2/out'.
     Finished prerequisites of target file `dir2/out/file.bar'.
    Must remake target `dir2/out/file.bar'.
copying dir2/out/../file.foo to dir2/out/file.bar
    Successfully remade target file `dir2/out/file.bar'.

It seems to think it remade dir1/out/file.bar, but it didn't run any targets/recipes to do so... I'm wondering what I missed...