Update logging levels in Rojo plugin and enhance test plans

- Promoted sync-related logging from Debug/Trace to Info level across multiple files, ensuring visibility of changes in the Studio output console.
- Added a new plan for expanding the connected mode test suite to cover multi-step scenarios and round-trip identity verification.
- Introduced a plan to fix stale tree desynchronization by implementing a validation mechanism on plugin connection.
- Created a plan to bump sync logging to Info level, detailing todos for various components in the plugin.

This update improves the clarity of logs and enhances testing coverage for connected mode scenarios.

plugin/src/ChangeBatcher/encodeInstance.lua

@@ -21,6 +21,7 @@ local Log = require(Packages.Log)
 local RbxDom = require(Packages.RbxDom)
 
 local encodeProperty = require(script.Parent.encodeProperty)
+local UNENCODABLE_DATA_TYPES = require(script.Parent.propertyFilter)
 
 -- Script class names that need Source property
 local SCRIPT_CLASS_NAMES = {
@@ -234,6 +235,10 @@ encodeInstance = function(instance, parentId, _skipPathCheck)
 				-- Get the full PropertyDescriptor for encoding
 				local descriptor = RbxDom.findCanonicalPropertyDescriptor(instance.ClassName, propertyName)
 				if descriptor then
+					if UNENCODABLE_DATA_TYPES[descriptor.dataType] then
+						continue
+					end
+
 					local encodeSuccess, encodeResult = encodeProperty(instance, propertyName, descriptor)
 					if encodeSuccess and encodeResult ~= nil then
 						properties[propertyName] = encodeResult

plugin/src/ChangeBatcher/encodePatchUpdate.lua

@@ -3,6 +3,7 @@ local Log = require(Packages.Log)
 local RbxDom = require(Packages.RbxDom)
 
 local encodeProperty = require(script.Parent.encodeProperty)
+local UNENCODABLE_DATA_TYPES = require(script.Parent.propertyFilter)
 
 return function(instance, instanceId, properties)
 	local update = {
@@ -21,6 +22,10 @@ return function(instance, instanceId, properties)
 				continue
 			end
 
+			if UNENCODABLE_DATA_TYPES[descriptor.dataType] then
+				continue
+			end
+
 			local encodeSuccess, encodeResult = encodeProperty(instance, propertyName, descriptor)
 
 			if not encodeSuccess then

plugin/src/ChangeBatcher/encodeProperty.lua

@@ -11,7 +11,13 @@ return function(instance, propertyName, propertyDescriptor)
 	end
 
 	local dataType = propertyDescriptor.dataType
-	local encodeSuccess, encodeResult = RbxDom.EncodedValue.encode(readResult, dataType)
+	local pcallOk, encodeSuccess, encodeResult = pcall(RbxDom.EncodedValue.encode, readResult, dataType)
+
+	if not pcallOk then
+		-- Encoder threw an error (e.g., Ref, Region3, SharedString)
+		Log.warn("Could not sync back property {:?}.{}: {}", instance, propertyName, encodeSuccess)
+		return false, nil
+	end
 
 	if not encodeSuccess then
 		Log.warn("Could not sync back property {:?}.{}: {}", instance, propertyName, encodeResult)

plugin/src/ChangeBatcher/init.lua

@@ -107,12 +107,11 @@ function ChangeBatcher:__flush()
 		return nil
 	end
 
-	-- Log summary at debug level
 	local addedCount = 0
 	for _ in pairs(patch.added) do
 		addedCount += 1
 	end
-	Log.debug("Two-way sync: {} updates, {} additions, {} removals", #patch.updated, addedCount, #patch.removed)
+	Log.info("Two-way sync: {} updates, {} additions, {} removals", #patch.updated, addedCount, #patch.removed)
 
 	return patch
 end

plugin/src/ChangeBatcher/propertyFilter.lua

@@ -0,0 +1,16 @@
+--[[
+	Property type blacklist for encoding, matching the server-side
+	filter_properties_for_meta behavior in src/web/api.rs.
+
+	Types listed here are skipped during property encoding because they
+	cannot be serialized to JSON or are meaningless for syncback.
+]]
+
+-- Property data types that cannot be encoded standalone.
+-- Matches the Variant::Ref / Variant::UniqueId filter in api.rs.
+local UNENCODABLE_DATA_TYPES = {
+	Ref = true, -- Instance references; need the InstanceMap, not encodable standalone
+	UniqueId = true, -- Internal Roblox identifiers; not meaningful for syncback
+}
+
+return UNENCODABLE_DATA_TYPES