TextChatService: OnIncomingMessage Callback; run twice per message

Bug Reports Studio Bugs
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#1

Originally wanted to help a user out but in the end he ran into a problem that was not caused by him, but by Roblox Studio itself.
Link to original forum post, which made me discover the bug: /tog to toggle chattag - #4 by kwkxbxkdkdjjd

Roblox Studio Version: 0.664.0.6640713 (latest version available)
Roblox Studio Beta Programs: “Dragger QoL Improvements”

100% Reproduction Chance.

Place File:
textchatservice_bug.rbxl (55.1 KB)

What happens? If you type something in chat and have a function hooked onto an OnIncomingMessage Callback on the TextChatService, the function will run twice per message for no apparent reason.

Reproduction Steps:

Open the Roblox Place file above and playtest it. Write something in the chat. The script (located in StarterPlayer > StarterPlayerScripts) will print out the content of the message sent, the timestamp and the MessgeID, which is a unique identifier of a Text Message(!)
If you type something in the chat you will see output like two message were sent, though only one was sent in reality.

image
image962×850 234 KB

Output Explained:
First line: message.Text
Second line: message.Timestamp
Third line: message.MessageId
Fourth line: Seperating Hyphens to indicate that the function runtime ends here

As can be seen in the image above, when looking in the Text Chat, I only sent 1 message, but in the output there are 2 blocks with the same Text Content, the SAME MessageID and a slightly different Timestamp value.

The main factor here is the MessageID. It prooves that this is about the exact same message.

System Information:
OS: Windows 11 Pro (Build 26100.3194)
CPU: Intel Core i7-13620H
RAM: 16GB DDR5 SDRAM 5200MHz (I had enough Standby and Free RAM Memory according to resmon and RAMMap)
dGPU: Nvidia GeForce RTX 4070 (running on latest Game-Ready Drivers)
iGPU: Intel Raptor Lake-P - Integrated Graphics (Raptor Lake-P/U GT2)

I have had no problems in the past with Roblox Studio regarding my system. I have nothing overclocked or undervolted. I keep my drivers up to date.

Expected behavior

I would expect the Callback to only run my function once per message as it seems to be explained behavior in the TextChatService Documentation.

#2

The documentation linked specifies that this behaviour is intended. It is run both when receiving the message locally and when receiving the filtered version from the server.

When bound to the client sending a message, this callback is run twice; first when the message is initially sent and received locally, and again when the client receives the result of the filtered message from the server.

#3

How did I even miss that? You are absolutely right. My bad and case closed i guess.

#4