Paradox has released the Stellaris 4.5.4 “Cygnus” hotfix, primarily targeting multiplayer stability problems introduced with the previous version. The official patch notes cover out-of-sync errors, account login trouble and crashes, alongside a fix for custom ship designs being deleted when joining a federation.
The synchronisation fixes address multiple Hotjoin out-of-sync issues, plus a separate problem affecting players using different languages. That language-related error occurred when a stored name used grammar — a specific case that makes it a relevant fix for groups playing together across different language settings.
There are also two changes around loading and connecting. Players should no longer be logged out of their Paradox account while the game loads, and the multiplayer lobby list now indicates when it is waiting for an online connection. The latter is a visibility improvement rather than another synchronisation fix: it gives players a clearer indication of what the lobby is doing during that wait.
For federation joiners, 4.5.4 fixes an issue that deleted their custom ship designs. That sits apart from the connection-focused changes, addressing a problem with players’ designs rather than whether their multiplayer session stays synchronised. It is a useful inclusion in a hotfix whose main purpose is stability.
The patch also fixes crashes involving Tempest relic storms, as well as enclave and mercenary trade offers. Those changes extend the hotfix beyond account access and multiplayer synchronisation to failures tied to specific in-game events and interactions.
![AION 2 - [Notice] Aware of Potential Login Issue - Steam News](https://www.a90skid.com/wp-content/uploads/2026/11/production-post-1794384822.png)
