mktemp creates file in pwd rather than in /tmp

Previously mktemp used to create files in /tmp. Today I noticed that mktemp is creating file in $PWD rather than in /tmp? ### Did I change something inadvertently? Any suggestions to fix this? --- Note: I am able to do: ls /tmp

$ mktemp --version
mktemp (GNU coreutils) 8.30

$ echo $TMPDIR

$