Coastlines not showing up when using worldmap with specified lat and long

I am trying to make a map centered on the San Diego county region, which shows the coastline and my datapoints. I am using scatterm to show the datapoints so I can have their values represented by the color of the point. Everything is working fine except the coastlines aren't showing up on the figure. I am not even getting any error messages, the line just doesn't show up (some of my points are directly on the coast so I know it's missing).

Here is my code:

WiSuCorrelationLats = [32.8663;32.7338;32.6997;32.8921;32.628208;32.885847;33.081050;32.901867;32.729578;33.268447];
WiSuCorrelationLongs = [-117.2546;-117.1993;-117.1830;-117.1310;-116.93928;-117.14314;-116.9757;-117.25046;-117.13934;-116.36505];

figure
worldmap([32.60 33.28],[-117.38 -116.85])
plotm(coastlat,coastlon)
scatterm(WiSuCorrelationLats,WiSuCorrelationLongs,25,WinterSummerSSTCorrelations.("Corr. w/ SST (Winter)"),'filled')
title('Correlations with SST (Winter)')
colorbar
caxis([0.5 1])

Oddly enough, I think this has something to do with the second line, where I specify the lat and long within the worldmap function, because when I try specifying worldmap("United States") instead of worldmap([32.60 33.28],[-117.38 -116.85]) the coastlines actually do show up on the figure. Unfortunately, I don't want a view of the entire US, I want a zoomed in view of just this region.

Here's the code using the entire US, which does produce a map with coastlines:

figure
load coastlines
worldmap("United States")
plotm(coastlat,coastlon)
scatterm(WiSuCorrelationLats,WiSuCorrelationLongs,25,WinterSummerSSTCorrelations.("Corr. w/ SST (Winter)"),'filled')
colorbar
caxis([0.5 1])

Am I missing something about how worldmap or coastlines works? Can you only view coastlines at a certain distance or something?