Map undiscovered after dying

This is make my life miserable
Especially i an SSF
Why it is like this?Why i have to discover the map again?

This is a LONG time bug, sometimes referred to as the "local storage bug".

There is a fairly easy temporary fix, which is:

1) Fully close Path of Exile

2) Launch a different game (at least to the main menu of that game)*

3) Fully close that game

4) Relaunch Path of Exile

*some games don't work. Older games seem to be more likely to work. You may have to try a few. I've heard PoE2 works, but I don't guarantee it.

Note that this will not bring back the map discovery you lost, it just remembers what you discover after this, instead of it being blank every time you reeneter a zone.