Hey there, i think i solved the problem. By using nested builder-fields and both having defaultView: preview broke the previews. By removing the defaultView from the container, the problem was solved. Appearently it almost looks the same as before and i think i can live with that. But maybe it is worth checking it out, why the errors happen or referencing it in the Docs if this was really the problem.
Anyway i get another strange error – i think it doesn’t belong here – that when i’m reloading the panel-page i get the 500-Error just as described here: Internal Server Error 500 when reload any panel page. This is the content of my .htaccess, just basic stuff i think:
# Kirby .htaccess
# rewrite rules
<IfModule mod_rewrite.c>
# enable awesome urls. i.e.:
# http://yourdomain.com/about-us/team
RewriteEngine on
# make sure to set the RewriteBase correctly
# if you are running the site in a subfolder.
# Otherwise links or the entire site will break.
#
# If your homepage is http://yourdomain.com/mysite
# Set the RewriteBase to:
#
# RewriteBase /mysite
# In some enviroments it's necessary to
# set the RewriteBase to:
#
RewriteBase /
# block text files in the content folder from being accessed directly
RewriteRule ^content/(.*)\.(txt|md|mdown)$ index.php [L]
# block all files in the site folder from being accessed directly
# except for requests to plugin assets files
#RewriteRule ^assets/plugins/([a-zA-Z0-9\.\-_%=]+)/(.*)$ site/plugins/$1/assets/$2 [L,N]
#RewriteCond $1 !^plugins/[a-zA-Z0-9\.\-_%=]+/assets/.*
RewriteRule ^site/(.*) index.php [L]
# block direct access to kirby and the panel sources
RewriteRule ^(kirby|panel\/app|panel\/tests)/(.*) index.php [L]
# make panel links work
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^panel/(.*) panel/index.php [L]
# make site links work
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) index.php [L]
</IfModule>
# Additional recommended values
# Remove comments for those you want to use.
#
# AddDefaultCharset UTF-8
#
# php_flag short_open_tag on