Phone app is starting separated SMS conversations

[piterq]

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.3.1

Affected Android/Custom ROM version

Android 15

Affected device model

Xiaomi 13T

How did you install the app?

GitHub releases

Steps to reproduce the bug

1. Go to call history.
2. Click on the 3 dots next to any item on the list.
3. Select "Send SMS".

Expected behavior

App should open last sms conversation with selected contact.

Actual behavior

The Phone app is opening its' own (new) conversation with selected contact, so if I send SMS this way, it will appear as a separate conversation with this contact in the SMS list. When this contact sends me SMS, it will appear in the previous conversation, not in the one that was started from the Phone app.

Screenshots/Screen recordings

Additional information

Previously I was using standard (stock) contacts, SMS and dialer applications, so I've got a lot of SMS messages which was created using these applications and these conversations are visible in Fossify Messages application.

[naveensingh]

This looks like a duplicate of FossifyOrg/Messages#294 but I'm not sure. Could you please check if it works okay when using some other messaging app?

[piterq]

I would say that this is related, but not the same. I've made some more tests, and everything is working as expected If I remove +48 from contact phone number. However, this is not a good solution because it will not work properly outside our country.
I set the stock "Messages" app as default and this app displays all messages with this contact in one conversation view even though some of these SMS messages were sent with the +48 prefix and others without the prefix.
So the problem with separated conversations (threads) occurs only if we're using +48 notation in contact phone numbers.

[Aga-C]

I've tested and it's the same issue.