Redundancy expected behavior when both gateway go active in case of split brain

Ignition
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Ignition 8.1.44

In case of split brain, when both gateway of a redundant pair can't reach the peer anymore, both gateway go active.

We can connect a perspective client on both side.

But from an history point of view, with a setting "history mode" = Full,
and "Use Active Uptime to Resolve Conflicts" = False
both gateway are supposed to store history if each gateway can reach the history database ?

History Mode How history is treated by the Backup system. If Full, history will be stored normally, as it would be on the Master system. If Partial, history will be cached until the Master is available again and the Backup node is able to determine the exact time that the Master was down.
Use Active Uptime to Resolve Conflicts New in 8.1.31 When enabled, the system will resolve data conflicts by examining if the Master node or Backup node have been active for longer. The redundancy data from the longer running active node will be selected, and will overwrite the data on the other node.
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If this is possible, your network design is broken. Client connections must route through the same subnet that connects the gateways to each other, such that network breakage between gateways cannot happen without also taking out client connections, too.

Full stop.