Weird behavior when receiving SMS and MMS in a short time

[Just-Regis]

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

1.8.0

Affected Android/Custom ROM version

Android 10

Affected device model

Xiaomi Mi 9

How did you install the app?

F-Droid / IzzyOnDroid

Steps to reproduce the bug

1. Receive a SMS (don't read it)
2. Receive a MMS from the same contact or not

Expected behavior

Both notifications (for SMS and MMS) appear with the correct number or contact name

Actual behavior

One of the notifications appears with the correct number or contact name, the other appears with a weird number. This weird notification doesn't disappear even if you have already read the message. When you touch this weird notification, an error appears (sorry, I forgot to take screenshots).

Screenshots/Screen recordings

No response

Additional information

No response