diff --git a/.changeset/switch-openjph-wasm.md b/.changeset/switch-openjph-wasm.md
new file mode 100644
index 00000000..93cf1996
--- /dev/null
+++ b/.changeset/switch-openjph-wasm.md
@@ -0,0 +1,8 @@
+---
+"zarrextra": minor
+"@spatialdata/vis": patch
+---
+
+Switch HTJ2K codec from `@cornerstonejs/codec-openjph` to `openjph-wasm`, which correctly round-trips multi-component (volumetric) HTJ2K data. The cornerstone build silently dropped components 2..N on decode; `openjph-wasm` handles arbitrary component counts losslessly.
+
+Also adds true z>1 multi-component chunk support: z-planes are now encoded as components of a single codestream rather than one plane per chunk. Exports `Htj2kPlane` from the package index.
diff --git a/packages/vis/scripts/dev.mjs b/packages/vis/scripts/dev.mjs
index 71fd5cb6..45a3090e 100644
--- a/packages/vis/scripts/dev.mjs
+++ b/packages/vis/scripts/dev.mjs
@@ -4,8 +4,8 @@ import {
   isPortInUse,
   listProcesses,
   portListeners,
-} from '../../scripts/dev-process-utils.mjs';
-import { FIXTURE_SERVER_PORT } from '../../scripts/fixture-server-port.mjs';
+} from '../../../scripts/dev-process-utils.mjs';
+import { FIXTURE_SERVER_PORT } from '../../../scripts/fixture-server-port.mjs';
 
 const DEMO_PORT = 5173;
 const pnpmCommand = process.platform === 'win32' ? 'pnpm.cmd' : 'pnpm';