jog: don't recurse on untyped tables

src/resources/filters/modules/jog.lua

@@ -92,8 +92,14 @@ local function recurse (element, tp, jogger)
   if leaf_node_tags[tag] then
     -- do nothing, cannot traverse any deeper
   elseif tp == 'table' then
-    for key, value in pairs(element) do
-      element[key] = jogger(value)
+    if element.long then
+      -- looks like a caption, so recurse into caption fields
+      element.long = jogger(element.long)
+      if element.short then
+        element.short = jogger(element.short)
+      end
+    else
+      -- do nothing, probably a custom node
     end
   elseif content_only_node_tags[tag] or tp == 'pandoc Cell' then
     element.content = jogger(element.content)