@upset_partridge @yang after an absolute ton of digging i think i figured out the issue
in plasmic-host.server.tsx change:
import {PlasmicClientCanvasHost} from '~/components/plasmic-helpers';
to
import {PlasmicClientCanvasHost} from '~/components/plasmic-helpers.client';
now i don’t get that error, and i’m able to access the plasmic-host page on localhost
also if you are using brave, make sure you turn off shields for plasmic or it won’t render the studio