Hi,
I found the issue. This is issue is something that Samsung most of the time forgets to fix. The issue is the inbuilt phone app. It has a strange bug that can cause this issue. Solution: Use a third-party dialler app to fix this. Make sure you set that dialler as the default for everything related to call. I used Truecaller.
Software analysis:
I found that the inbuilt phone app is the one that actually handles WhatsApp call logs. Now this is counter intuitive but if you are an android developer, you can pretty much verify this. So, all the issues on WhatsApp call are due to this inbuilt buggy phone app. Why does it not happen on all models? well this seems to be some kind of native code that Samsung has to manage but they forget to. Unfortunately, they also don't seem to have any test case around it to avoid such kind of bugs. This bug is even present on my Samsung s23 plus and this post was back in 2020 so 3 years of 0 backtracking to avoid such bugs to appear. Also, I do not find any samsung employee acknowledging this issue. Why? because it would put the name of the Samsung in shame. I would say just fix the issue. I do not like to use a third-party caller app.
