Remove template lookup cache in build mode. Fixes #1301

middleman-core/lib/middleman-core/template_renderer.rb

@@ -161,11 +161,23 @@ module Middleman
     # @param [String] request_path
     # @option options [Boolean] :preferred_engine If set, try this engine first, then fall back to any engine.
     # @return [String, Boolean] Either the path to the template, or false
-    Contract IsA['Middleman::Application'], Or[Symbol, String], Hash => Maybe[String]
+    Contract IsA['Middleman::Application'], Or[Symbol, String], Maybe[Hash] => Maybe[String]
     def self.resolve_template(app, request_path, options={})
       # Find the path by searching or using the cache
       request_path = request_path.to_s
+
+      # Cache lookups in build mode only
+      if app.build?
         cache.fetch(:resolve_template, request_path, options) do
+          uncached_resolve_template(app, request_path, options)
+        end
+      else
+        uncached_resolve_template(app, request_path, options)
+      end
+    end
+
+    Contract IsA['Middleman::Application'], String, Hash => Maybe[String]
+    def self.uncached_resolve_template(app, request_path, options)
       relative_path = Util.strip_leading_slash(request_path)
       on_disk_path  = File.expand_path(relative_path, app.source_dir)
 
@@ -217,5 +229,4 @@ module Middleman
       end
     end
   end
-  end
 end