Text and audio responses intermittently missing spaces between words

Integrations Unity SDK
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1

What do you need help with?

Bug report

Installation method

Unity Asset Store

Issue area

Other

Impact

Normal - something is not working as expected

Unity version

Unity 6.4 (6000.4.3.f1

Convai Unity SDK version

4.4.0

Character ID

f9998ec6-05f7-11f0-830a-42010a7be01a

Session ID

6754d146-3047-4185-aa42-5d3f20758d84

Target platform

Windows

Build settings

Mono

Where does it happen?

Only after build

Short summary

Words getting concatenated (no spaces) in text and audio — Windows desktop build

What happened?

Intermittently, the character’s response is returned with words merged together — missing spaces in the displayed text, and the same words slurred/mashed together in the synthesized audio instead of spoken naturally. This isn’t constant — some responses in the same session render and speak correctly, while others show this pattern. Occurring in our shipped desktop build using the Convai Unity plugin (installed via Unity Asset Store), not in the web Playground. Both text and audio show the same corruption, suggesting the issue happens upstream of TTS synthesis — likely in how the response is chunked/streamed and reassembled before being passed to the plugin. See attached screenshot: first two responses render with normal spacing, third response (“Yes,Icanseeyou.Ifthere’sanythingyouwanttotalkabout…”) shows words merged with no spacing.

What did you expect?

Text and audio responses should consistently have correct word spacing/separation, matching the raw LLM-generated response every time.

Steps to reproduce

  1. Launch the desktop build and start a conversation with the character
  2. Send several consecutive messages back and forth
  3. Observe that some responses render/speak correctly, while others intermittently show merged words in both text output and audio

Screenshots, recording, logs, or minimal repro

Screenshot 2026-08-12 164236.png
Screenshot 2026-08-12 164236.png395×222 11.7 KB
Screenshot 2026-08-12 164306.png
Screenshot 2026-08-12 164306.png443×979 51.5 KB

I checked the relevant documentation, resources, and similar forum posts before posting.

on

I confirm that I did not include API keys, tokens, passwords, secrets, private character data, private conversation logs, or customer data.

on

2

Follow-up: Tested by duplicating the character and switching Core AI Settings to gemini-2.5-flash-lite. The word-jumbling issue still occurs. Since this reproduces across two different LLM providers (gpt-4o and gemini-2.5-flash-lite) with default settings otherwise unchanged. This happens in build and in Unity preview as well apparently

3

Could you please try testing it again?

I tested your character on my side, and the responses appear to be working as expected.