Why hasn't DSCOVR's trajectory determination been updated in JPL's Horizons after 2015-Aug-4?

I tried to download orbital positions for the DSCOVR spacecraft in its Lissajous orbit around Sun-Earth L1 from JPL's Horizons web page but I was surprised to see the following!

No ephemeris for target "DSCOVR (spacecraft)" after A.D. 2017-JAN-03 12:06:08.1840 TDB

Question: According to the output, nothing has been done in Horizons for this NASA spacecraft after 2015-Aug-4? The data between then and 2017 is only a prediction, and there's nothing after that Why not?

Is there a plan to drop DSCOVR from Horizons, or conversely to update its trajectory there? Or is current tracking data not of sufficient precision to warrant including in Horizons?

Surely the spacecraft is still being tracked regularly somehow! See Where are post-2017 EPIC images of Earth and the DSCOVR spacecraft coordinates available for download?

SPACECRAFT TRAJECTORY:
Concatenated trajectories (DSN)
Based on tracking data through 2015-Aug-4, prediction thereafter.

Trajectory name                            Start (TDB)          Stop (TDB)
------------------------------------    -----------------   -----------------
DSCO-2015-02-11-Nominal_withMCC.V0.1    2015-Feb-11 23:46   2015-Mar-09
23month_20150309_01.V0.1                2015-Mar-09         2015-Jul-13
21day_20150803_01.V0.1                  2015-Jul-13         2015-Aug-03
21day_20150803_01.V0.1                  2015-Aug-03         2015-Aug-04
18month_20150804_01.V0.1                2015-Aug-04         2017-Jan-03 12:06


• – uhoh Jun 27 at 4:51