fix for layouts

src/resources/filters/customnodes/floatreftarget.lua

@@ -42,12 +42,21 @@ _quarto.ast.add_handler({
   end
 })
 
-function cap_location(float)
-  local ref = refType(float.identifier)
+function cap_location(float_or_layout)
+  local ref = refType(float_or_layout.identifier)
+  -- layouts might not have good identifiers, but they might have
+  -- ref-parents
+  if ref == nil then
+    ref = refType(float_or_layout.attributes["ref-parent"])
+  end
+  -- last resort, pretend we're a figure
+  if ref == nil then
+    ref = "fig"
+  end
   local qualified_key = ref .. '-cap-location'
   local result = (
-    float.attributes[qualified_key] or
-    float.attributes['cap-location'] or
+    float_or_layout.attributes[qualified_key] or
+    float_or_layout.attributes['cap-location'] or
     option_as_string(qualified_key) or
     option_as_string('cap-location') or
     crossref.categories.by_ref_type[ref].default_caption_location)