diff -r 8dc9d979bbac -r b6d74c90b588 src/Pure/Thy/document_build.scala
--- a/src/Pure/Thy/document_build.scala	Wed Aug 03 13:07:32 2022 +0200
+++ b/src/Pure/Thy/document_build.scala	Wed Aug 03 13:49:41 2022 +0200
@@ -167,8 +167,10 @@
 
     def documents: List[Document_Variant] = info.documents
 
-    def session_theories: List[Document.Node.Name] = base.session_theories
-    def document_theories: List[Document.Node.Name] = session_theories ::: base.document_theories
+    def proper_session_theories: List[Document.Node.Name] = base.proper_session_theories
+
+    def document_theories: List[Document.Node.Name] =
+      proper_session_theories ::: base.document_theories
 
     lazy val document_latex: List[File.Content_XML] =
       for (name <- document_theories)
@@ -188,7 +190,7 @@
       val path = Path.basic("session.tex")
       val content =
         Library.terminate_lines(
-          base.session_theories.map(name => "\\input{" + tex_name(name) + "}"))
+          base.proper_session_theories.map(name => "\\input{" + tex_name(name) + "}"))
       File.Content(path, content)
     }