I only have two Matter Sockets in my HA environment which are managed by the Matter Server integration. After the upgrade to 8.1.2 the sockets were not working anymore and not recognized by the integration. Downgrade to 8.1.1 and they are working again.
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A bit more information is needed here.
What sockets?
What does the logs say?
Did you try to re-pair them?
Other steps done?
Just common smart Matter sockets.
The log says nothing
Why should I repair when an upgrade breaks things ?
Did a restart, no effect.
My first interest is of other people have the same exprience. If not, I will look further.
Well, I have Onvis S4 and Eve Energy.
Those are also common smart sockets, so it must be something in your setup then.
So no communication at all. Not even when trying to re-pair?
Maybe the previous setup had an error in its setup and it is incompatible with the new “correct” version.
Well, my common devices work.
I’m not sure, but I think you are talking about the socket between the Matter Integration and the Matter Server. Mine are working fine. Maybe provide some more information on what you are seeing.
If you are talking about the Websocket that exposes the Matter Server API to outside application, then mine are also working.
I mean power socket or smart plug
FYI i just opened an issue due to the matter server crashing after updating to 8.1.2
Matter Server crashing · Issue #4272 · home-assistant/addons
downgrading restored full functionality - yay backups.
Performed an update for the second time and… no problems now. I now understand that the Matter server (add-on) and the Matter integration are two separate components with their own functions. I think something went wrong between them the first time, although I’m not sure what.
First I looked in the HA Core log, but the add-on has its own log and … is logging a lot. Could not find an error that I clould associate with the problem I had. After the succesfull second try I found the following error in the add-on log but despite of that all works fine:
2025-12-19 21:30:58.351 (Dummy-2) CHIP_ERROR [chip.native.DIS] Failed to advertise records: src/inet/UDPEndPointImplSockets.cpp:417: OS Error 0x02000065: Network is unreachable.
Yeah, sadly it also logs a lot of errors, that probably should be warnings, because they have no effect on the use of the addon.
The warnings seems to be more informal, so those are wrong too.
+1
There’s this also → Matter: all matter devices not available since 8.1.2 (Bump Python Matter Server to 8.1.2) update · Issue #159459 · home-assistant/core · GitHub
I am going to try to downgrade to 8.1.1 now 
8.1.1 solved my issue. I am all back working with my Matter devices now.
I remember the second time I did the upgrade it was started from the main screen from the add-on itself. Perhaps that makes a difference…
But when it is working now I can imagine that you would not take that chance …