Can you try the following?Change this:<sly  data-sly-resource="${resource @ appendPath='/jcr:content/root/news'}">to<sly  data-sly-resource="${'root/news' @ resourceType='your resource type'">

Can you raise a support ticket for this?

should you not have: ${list[map]['title']}

Here an example that I wrote on using a HashMap:htl-examples/HashMapExample.java at master · heervisscher/htl-examples · GitHub

Also make sure to install CFP1 / 6.3.0.1It has this fix for this parsys:The HTL based Paragraph System component (/libs/wcm/foundation/components/parsys) should be adapted to the new component wrapper behavior. NPR-16980; Hotfix for CQ-4206620, CQ-4206621

I made an example too, can you check and compare? htl-examples/TitleImpl.java at master · heervisscher/htl-examples · GitHub

Is the forms package required?

Not sure if things are changed here. Can you make a small package, so I can test this?

Indeed, can you share the imports too from your class.

Looking at your sample you are using SlingHttpServletRequest.class in your second example.Can you compare your code with the core components? They are using this pattern too.