Antora nested attributes not rendered in preview

[carlcsaposs-canonical]

Observed vs. expected behavior

Observed behavior

Attributes defined in antora.yml that reference other attributes do not resolve those attributes when rendered in the preview

# antora.yml
name: ROOT
asciidoc:
  attributes:
    attr1: 'foo'
    attr2: 'bar{attr1}'

Expected behavior

Attributes defined in antora.yml that reference other attributes resolve those attributes when rendered in the preview

Example expected preview:

barfoo

Steps to reproduce

1. Create antora.yaml with contents:

   name: ROOT
   asciidoc:
     attributes:
       attr1: 'foo'
       attr2: 'bar{attr1}'

2. Create modules/ROOT/pages/foo.adoc with contents:

   {attr2}
   

3. Open IDE preview for foo.adoc

Environment

Plugin Version: 0.44.7

IntelliJ Details:
PyCharm 2025.1.3.1
Build #PY-251.26927.90, built on July 10, 2025
Source revision: 32bba9696423d
Licensed to Canonical, Ltd / Carl Csaposs
Subscription is active until November 28, 2025.
Runtime version: 21.0.7+9-b895.130 amd64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.X11.XToolkit
Linux 6.8.0-60-generic
Ubuntu 22.04.5 LTS; glibc: 2.35
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 4096M
Cores: 8
Registry:
debugger.new.tool.window.layout=true
ide.experimental.ui=true
Non-Bundled Plugins:
com.4lex4.precious-themes-intellij-platform (241.0)
org.asciidoctor.intellij.asciidoc (0.44.7)
com.dmarcotte.handlebars (251.23774.318)
Current Desktop: ubuntu:GNOME

Additional information

Nested attributes work if they are defined in the document instead of antora.yml