diff --git a/openpype/hosts/nuke/api/lib.py b/openpype/hosts/nuke/api/lib.py
index 7b1aaa8fe0..af07092daf 100644
--- a/openpype/hosts/nuke/api/lib.py
+++ b/openpype/hosts/nuke/api/lib.py
@@ -2316,27 +2316,53 @@ Reopening Nuke should synchronize these paths and resolve any discrepancies.
         ''' Adds correct colorspace to write node dict
 
         '''
-        for node in nuke.allNodes(filter="Group"):
+        for node in nuke.allNodes(filter="Group", group=self._root_node):
+            log.info("Setting colorspace to `{}`".format(node.name()))
 
             # get data from avalon knob
             avalon_knob_data = read_avalon_data(node)
+            node_data = get_node_data(node, INSTANCE_DATA_KNOB)
 
-            if avalon_knob_data.get("id") != "pyblish.avalon.instance":
+            if (
+                # backward compatibility
+                # TODO: remove this once old avalon data api will be removed
+                avalon_knob_data
+                and avalon_knob_data.get("id") != "pyblish.avalon.instance"
+            ):
+                continue
+            elif (
+                node_data
+                and node_data.get("id") != "pyblish.avalon.instance"
+            ):
                 continue
 
-            if "creator" not in avalon_knob_data:
+            if (
+                # backward compatibility
+                # TODO: remove this once old avalon data api will be removed
+                avalon_knob_data
+                and "creator" not in avalon_knob_data
+            ):
+                continue
+            elif (
+                node_data
+                and "creator_identifier" not in node_data
+            ):
                 continue
 
-            # establish families
-            families = [avalon_knob_data["family"]]
-            if avalon_knob_data.get("families"):
-                families.append(avalon_knob_data.get("families"))
+            nuke_imageio_writes = None
+            if avalon_knob_data:
+                # establish families
+                families = [avalon_knob_data["family"]]
+                if avalon_knob_data.get("families"):
+                    families.append(avalon_knob_data.get("families"))
 
-            nuke_imageio_writes = get_imageio_node_setting(
-                node_class=avalon_knob_data["families"],
-                plugin_name=avalon_knob_data["creator"],
-                subset=avalon_knob_data["subset"]
-            )
+                nuke_imageio_writes = get_imageio_node_setting(
+                    node_class=avalon_knob_data["families"],
+                    plugin_name=avalon_knob_data["creator"],
+                    subset=avalon_knob_data["subset"]
+                )
+            elif node_data:
+                nuke_imageio_writes = get_write_node_template_attr(node)
 
             log.debug("nuke_imageio_writes: `{}`".format(nuke_imageio_writes))
 
diff --git a/openpype/pipeline/colorspace.py b/openpype/pipeline/colorspace.py
index a67457b1bf..2800050496 100644
--- a/openpype/pipeline/colorspace.py
+++ b/openpype/pipeline/colorspace.py
@@ -27,6 +27,9 @@ class CachedData:
     has_compatible_ocio_package = None
     config_version_data = {}
     ocio_config_colorspaces = {}
+    allowed_exts = {
+        ext.lstrip(".") for ext in IMAGE_EXTENSIONS.union(VIDEO_EXTENSIONS)
+    }
 
 
 class DeprecatedWarning(DeprecationWarning):
@@ -361,7 +364,7 @@ def parse_colorspace_from_filepath(
 
     # match colorspace from  filepath
     regex_pattern = _get_colorspace_match_regex(
-        colorspaces + underscored_colorspaces.keys())
+        list(colorspaces) + list(underscored_colorspaces))
     match = regex_pattern.search(filepath)
     colorspace = match.group(0) if match else None