diff --git a/src/app/components/ErrorPanel.tsx b/src/app/components/ErrorPanel.tsx
index e14062d1..4517f41c 100644
--- a/src/app/components/ErrorPanel.tsx
+++ b/src/app/components/ErrorPanel.tsx
@@ -1,19 +1,20 @@
 import type { ComponentChildren } from 'preact'
 import { getCurrentUrl } from 'preact-router'
 import { useEffect, useMemo, useState } from 'preact/hooks'
-import { useVersion } from '../contexts/Version.jsx'
-import { latestVersion } from '../services/DataFetcher.js'
 import { Store } from '../Store.js'
 import { getGenerator } from '../Utils.js'
+import { useVersion } from '../contexts/Version.jsx'
+import { latestVersion } from '../services/DataFetcher.js'
 import { Octicon } from './index.js'
 
 type ErrorPanelProps = {
 	error: string | Error,
 	reportable?: boolean,
 	onDismiss?: () => unknown,
+	body?: string,
 	children?: ComponentChildren,
 }
-export function ErrorPanel({ error, reportable, onDismiss, children }: ErrorPanelProps) {
+export function ErrorPanel({ error, reportable, onDismiss, body: body_, children }: ErrorPanelProps) {
 	const { version } = useVersion()
 	const [stackVisible, setStackVisible] = useState(false)
 	const [stack, setStack] = useState<string | undefined>(undefined)
@@ -54,9 +55,12 @@ export function ErrorPanel({ error, reportable, onDismiss, children }: ErrorPane
 		if (source) {
 			body += `\n### Generator JSON\n<details>\n<pre>\n${JSON.stringify(source, null, 2)}\n</pre>\n</details>\n`
 		}
+		if (body_) {
+			body += body_
+		}
 		url += `&body=${encodeURIComponent(body)}`
 		return url
-	}, [error, version, stack, source, gen?.id])
+	}, [error, body_, version, stack, source, gen?.id])
 
 	return <div class="error">
 		{onDismiss && <div class="error-dismiss" onClick={onDismiss}>{Octicon.x}</div>}
diff --git a/src/app/components/customized/CustomizedGenerator.ts b/src/app/components/customized/CustomizedGenerator.ts
index 101ff8f8..52efb253 100644
--- a/src/app/components/customized/CustomizedGenerator.ts
+++ b/src/app/components/customized/CustomizedGenerator.ts
@@ -261,7 +261,7 @@ function generateOreFeatures(ctx: Context) {
 		} else {
 			const placed = deepClone(ctx.vanilla['worldgen/placed_feature'].get(name))
 			if (value.tries !== initial.tries) {
-				const modifier = placed.placement.find((m: any) => m.type === 'minecraft:count' || m.type === 'rarity_filter')
+				const modifier = placed.placement.find((m: any) => m.type === 'minecraft:count' || m.type === 'minecraft:rarity_filter')
 				if (Number.isInteger(value.tries)) {
 					modifier.type = 'minecraft:count',
 					modifier.count = value.tries
diff --git a/src/app/pages/Customized.tsx b/src/app/pages/Customized.tsx
index e97533f1..62c2a353 100644
--- a/src/app/pages/Customized.tsx
+++ b/src/app/pages/Customized.tsx
@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useErrorBoundary, useMemo, useRef, useState } from 'preact/hooks'
 import config from '../Config.js'
-import { writeZip } from '../Utils.js'
+import { deepClone, deepEqual, writeZip } from '../Utils.js'
 import { BasicSettings } from '../components/customized/BasicSettings.jsx'
 import { generateCustomized } from '../components/customized/CustomizedGenerator.js'
 import { CustomizedModel } from '../components/customized/CustomizedModel.js'
@@ -89,8 +89,21 @@ export function Customized({}: Props) {
 				<Btn icon="download" label="Create" class="customized-create" onClick={generate} />
 				<a ref={download} style="display: none;"></a>
 			</div>
-			{error && <ErrorPanel error={error} onDismiss={() => setError(null)} />}
+			{error && <ErrorPanel error={error} onDismiss={() => setError(null)} body={`\n### Customized settings\n<details>\n<pre>\n${JSON.stringify(getDiffModel(model, initialModel), null, 2)}\n</pre>\n</details>\n`} />}
 		</div>
 		<Footer />
 	</main>
 }
+
+function getDiffModel(model: any, initial: any) {
+	const result = deepClone(model)
+	if (typeof result !== 'object' || result === null) return
+	Object.keys(result).forEach(key => {
+		if (deepEqual(result[key], initial[key])) {
+			delete result[key]
+		} else if (typeof result[key] === 'object' && result[key] !== null) {
+			result[key] = getDiffModel(result[key], initial[key])
+		}
+	})
+	return result
+}