diff --git a/panel/io/convert.py b/panel/io/convert.py
index 08be802dcc..b1ee904c7a 100644
--- a/panel/io/convert.py
+++ b/panel/io/convert.py
@@ -348,7 +348,7 @@ def script_to_html(
             loading_style = f'<style type="text/css">\n{loading_base}\n</style>'
         else:
             loading_style = f'<link rel="stylesheet" href="{CDN_DIST}css/loading.css" type="text/css" />'
-    css_resources.append(loading_style)
+        css_resources.append(loading_style)
     spinner_css = loading_css(
         config.loading_spinner, config.loading_color, config.loading_max_height
     )
diff --git a/panel/tests/ui/io/test_convert.py b/panel/tests/ui/io/test_convert.py
index b4ed470917..07791d18a0 100644
--- a/panel/tests/ui/io/test_convert.py
+++ b/panel/tests/ui/io/test_convert.py
@@ -41,6 +41,13 @@
 pn.Row(button, pn.bind(lambda c: c, button.param.clicks)).servable();
 """
 
+template_button_app = """
+import panel as pn
+pn.extension(template='bootstrap')
+button = pn.widgets.Button()
+pn.Row(button, pn.bind(lambda c: c, button.param.clicks)).servable();
+"""
+
 slider_app = """
 import panel as pn
 slider = pn.widgets.FloatSlider()
@@ -180,6 +187,19 @@ def test_pyodide_test_convert_button_app(http_serve, page, runtime):
     assert [msg for msg in msgs if msg.type == 'error' and 'favicon' not in msg.location['url']] == []
 
 
+@pytest.mark.parametrize('runtime', ['pyodide', 'pyscript', 'pyodide-worker'])
+def test_pyodide_test_convert_template_button_app(http_serve, page, runtime):
+    msgs = wait_for_app(http_serve, button_app, page, runtime)
+
+    expect(page.locator('pre:not([class])')).to_have_text('0')
+
+    page.click('.bk-btn')
+
+    expect(page.locator('pre:not([class])')).to_have_text('1')
+
+    assert [msg for msg in msgs if msg.type == 'error' and 'favicon' not in msg.location['url']] == []
+
+
 @pytest.mark.parametrize('runtime', ['pyodide', 'pyscript', 'pyodide-worker'])
 def test_pyodide_test_convert_slider_app(http_serve, page, runtime):
     msgs = wait_for_app(http_serve, slider_app, page, runtime)