Tested:

On current 6.2.2-SNAPSHOT

Situation:

• A node has the property 'jcrName' from a app.
  only when a Node has the proeprty 'jcrName' this problem exists. And all nodes generated form a genericApp will have it! see MGNLUI-6007
• The JCR Browser app uses the 'jcrName' to display the name of the node, the default behavior of all apps.

Problem Major:

One can not change the node name! Not at all!

One can double click the name, but only edits the value of the property 'jcrName' (orange) BUT NOT the node name itself (red) (not as the form field does in detail subApp). So the node name is untouched and can therefore not be changed via the JCR Browser app (red).

Problem Minor

You don't see the real physical node name in the JCR browser app, you always see the the 'jcrName' if existing. This is very confusing for beginners, and even for people with more experience. Especially it is an inconsistent behavior to all former JCR-Browsers.

No workaround

Also there is no workaround, I tried it with the decorator and all its variations:

subApps: 
  browser: 
    workbench: 
      contentViews: 
        tree: 
          columns: 
            name:
              class: info.magnolia.ui.contentapp.column.jcr.JcrTitleColumnDefinition
              #$type: jcrTitleColumn
              propertyName: name
              #name: name

I would have expected targeting a non existing property will work, as also in all other apps. When the property does not exist, it usually displays the physical node name.
But its not falling back to the node name when the property does not exists, which is strange behavior as it works properly if 'jcrBrowser' does not exist.