ps -q does not show threads with -L option

Starting with release 4.0, the following changes:

$ ./ps/pscommand -L 4974
  PID   LWP TTY      STAT   TIME COMMAND
 4974  4974 pts/1    Sl+    0:00 ./a.out
 4974  4975 pts/1    Sl+    0:00 ./a.out
 4974  4976 pts/1    Sl+    0:00 ./a.out
$ ./ps/pscommand -L -q 4974
  PID   LWP TTY          TIME CMD
 4974  4974 pts/1    00:00:00 a.out

Note it used to work:

$ ps -L -q 4974
  PID   LWP TTY          TIME CMD
 4974  4974 pts/1    00:00:00 a.out
 4974  4975 pts/1    00:00:00 a.out
 4974  4976 pts/1    00:00:00 a.out
$ ps --version
ps from procps-ng 3.3.17