The issue was addressed with improved deletion. This issue is fixed in iOS 13.4 and iPadOS 13.4. Deleted messages groups may still be suggested as an autocompletion.
https://support.apple.com/HT211102
Source: Mitre, NVD
Published: 2020-04-01
Updated: 2022-07-12
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N