diff --git a/src/app/components/generator/SchemaGenerator.tsx b/src/app/components/generator/SchemaGenerator.tsx
index 0d87c44a..70963bb5 100644
--- a/src/app/components/generator/SchemaGenerator.tsx
+++ b/src/app/components/generator/SchemaGenerator.tsx
@@ -42,13 +42,13 @@ export function SchemaGenerator({ gen, allowedVersions }: Props) {
 	const ignoreChange = useRef(false)
 
 	const { value: docAndNode } = useAsync(async () => {
-		let data: unknown = undefined
+		let text: string | undefined = undefined
 		if (currentPreset && sharedSnippetId) {
 			setSharedSnippetId(undefined)
 			return AsyncCancel
 		}
 		if (currentPreset) {
-			data = await loadPreset(currentPreset)
+			text = await loadPreset(currentPreset)
 			ignoreChange.current = true
 		} else if (sharedSnippetId) {
 			const snippet = await getSnippet(sharedSnippetId)
@@ -73,22 +73,22 @@ export function SchemaGenerator({ gen, allowedVersions }: Props) {
 			}
 			Analytics.openSnippet(gen.id, sharedSnippetId, version)
 			ignoreChange.current = true
-			data = snippet.data
+			text = snippet.text
 		} else if (file) {
 			if (project.version && project.version !== version) {
 				changeVersion(project.version, false)
 				return AsyncCancel
 			}
 			ignoreChange.current = true
-			data = file.data
+			text = JSON.stringify(file.data, null, 2)
 		}
 		if (!service || !uri) {
 			return AsyncCancel
 		}
-		if (data) {
-			await service.writeFile(uri, JSON.stringify(data, null, 2))
+		if (text !== undefined) {
+			await service.writeFile(uri, text)
 		}
-		// TODO: if data is undefined, set to generator's default
+		// TODO: if text is undefined, set to generator's default
 		const docAndNode = await service.getFile(uri, () => '{}')
 		Analytics.setGenerator(gen.id)
 		return docAndNode
@@ -182,6 +182,7 @@ export function SchemaGenerator({ gen, allowedVersions }: Props) {
 		} catch (e) {
 			setError(`Cannot load preset ${id} in ${version}`)
 			setCurrentPreset(undefined, true)
+			return undefined
 		}
 	}
 
diff --git a/src/app/components/previews/Deepslate.ts b/src/app/components/previews/Deepslate.ts
index 7135dc7d..fd9ccbc6 100644
--- a/src/app/components/previews/Deepslate.ts
+++ b/src/app/components/previews/Deepslate.ts
@@ -1,7 +1,7 @@
 import * as deepslate19 from 'deepslate/worldgen'
-import { clamp, computeIfAbsent, computeIfAbsentAsync, deepClone, deepEqual, isObject, square } from '../../Utils.js'
 import type { VersionId } from '../../services/index.js'
 import { checkVersion, fetchAllPresets, fetchPreset } from '../../services/index.js'
+import { clamp, computeIfAbsent, computeIfAbsentAsync, deepClone, deepEqual, isObject, safeJsonParse, square } from '../../Utils.js'
 
 export type ProjectData = Record<string, Record<string, unknown>>
 
@@ -131,7 +131,7 @@ export class Deepslate {
 			const preset = biomeState.preset.replace(/^minecraft:/, '')
 			const biomes = await computeIfAbsentAsync(this.presetCache, `${version}-${preset}`, async () => {
 				const dimension = await fetchPreset(version, 'dimension', preset === 'overworld' ? 'overworld' : 'the_nether')
-				return dimension.generator.biome_source.biomes
+				return safeJsonParse(dimension)?.generator.biome_source.biomes
 			})
 			biomeState = { type: biomeState.type, biomes }
 		}
diff --git a/src/app/services/DataFetcher.ts b/src/app/services/DataFetcher.ts
index b68b53c2..28a9d405 100644
--- a/src/app/services/DataFetcher.ts
+++ b/src/app/services/DataFetcher.ts
@@ -139,7 +139,7 @@ export async function fetchPreset(versionId: VersionId, registry: string, id: st
 			url = `${mcmeta(version, type)}/${type}/minecraft/${registry}/${id}.json`
 		}
 		const res = await fetch(url)
-		return await res.json()
+		return await res.text()
 	} catch (e) {
 		throw new Error(`Error occurred while fetching ${registry} preset ${id}: ${message(e)}`)
 	}
diff --git a/src/app/services/Sharing.ts b/src/app/services/Sharing.ts
index 1b780eaf..5cdae21b 100644
--- a/src/app/services/Sharing.ts
+++ b/src/app/services/Sharing.ts
@@ -1,5 +1,4 @@
 import lz from 'lz-string'
-import { safeJsonParse } from '../Utils.js'
 import type { VersionId } from './Versions.js'
 
 const API_PREFIX = 'https://snippets.misode.workers.dev'
@@ -30,7 +29,7 @@ export async function getSnippet(id: string) {
 		const snippet = await fetchApi(`/${id}`)
 		return {
 			...snippet,
-			data: safeJsonParse(lz.decompressFromBase64(snippet.data) ?? '{}') ?? {},
+			text: lz.decompressFromBase64(snippet.data) ?? '{}',
 		}
 	} catch (e) {
 		if (e instanceof Error) {