[WEBJS] - WAHA is connected and working correctly.

[Danylooo]

Describe the bug

WAHA is connected and working correctly.

Messages sent to some contacts are delivered successfully:

ack = 2
ackName = DEVICE

However, for a specific contact, messages remain permanently in:

ack = 0

The message is created successfully but is never accepted by WhatsApp.

Working contact example:

• chatId: 241244185837663@lid
• ack: 2

Failing contact example:

• chatId: 152514305507454@lid
• ack: 0

Session status:

• CONNECTED

WAHA creates the message successfully but it never progresses beyond ack 0.

Is there a known issue with specific @lid identifiers or contact resolution when sending messages?

A clear and concise description of what the bug is. Feel free to remove sections
that you don't feel to make the text shorter!

Version

Get the WAHA version by calling GET /api/version

{
  "version": "YYYY.MM.DD",
  "engine": "ENGINE",
  "tier": "TIER"
}

Try to update to
the latest version before
creating an issue!

Steps

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

A clear and concise description of what you expected to happen.

Requests - Responses

Please attach all sent requests, responses that you sent.

Docker Logs

Collect and attach related docker logs if you have any
https://waha.devlike.pro/docs/how-to/deploy/#viewing-the-logs

Screenshots

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Additional context

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[Danylooo]

After further investigation, I found that the issue does not seem to be related to the recipient.

The same recipient:

152514305507454@lid

behaves differently depending on the sender identity used by WAHA.

Failed message:

{
  "from": "246845443977452@lid",
  "to": "152514305507454@lid",
  "ack": -1,
  "ackName": "ERROR"
}

Successful message:

{
  "from": "393793397595@c.us",
  "to": "152514305507454@lid",
  "ack": 2,
  "ackName": "DEVICE"
}

The destination @lid is exactly the same in both cases.

The only visible difference is the sender identity:

• Failing: 246845443977452@lid
• Working: 393793397595@c.us

WAHA is connected and can successfully send messages to other contacts.

The issue seems to occur mostly with newly created contacts/chats.

Could this be related to sender identity resolution, LID mapping, chat initialization, or a synchronization issue between WhatsApp Multi-Device and WAHA?

Any guidance on how WAHA determines the sender identity (@lid vs @c.us) would be appreciated.