diff --git a/helper/schema/field_reader_config.go b/helper/schema/field_reader_config.go
index 55a301d81..cf50e23c0 100644
--- a/helper/schema/field_reader_config.go
+++ b/helper/schema/field_reader_config.go
@@ -93,6 +93,18 @@ func (r *ConfigFieldReader) readField(
 		}
 	}
 
+	if protoVersion5 {
+		// Check if the value itself is unknown.
+		// The new protocol shims will add unknown values to this list of
+		// ComputedKeys. THis is the only way we have to indicate that a
+		// collection is unknown in the config
+		for _, unknown := range r.Config.ComputedKeys {
+			if k == unknown {
+				return FieldReadResult{Computed: true, Exists: true}, nil
+			}
+		}
+	}
+
 	switch schema.Type {
 	case TypeBool, TypeFloat, TypeInt, TypeString:
 		return r.readPrimitive(k, schema)