5.1 issue on AllWinner H6 Beelink S1

Since the upgrade to version 12.0.2 on my Beelink S1 (Allwinner H6), the central channel is not broadcast. I have 4 surrounds (2 front and 2 rear) + the Sub but not the central one which notably broadcasts the voices.

The 2.0 and 2.1 modes in the settings are the only ones to broadcast the entire sound, but obviously only on the two front surrounds. The Passthrought does not change anything, and it keeps the settings indicated in the sound menu.

hardware side:
box: Alwinner H6 - Beelink S1
TV: Samsung TY59CU7095UXXC - HDMI eARC disabled
Home theater: Sony BDV-N590 - HDMI ARC compatible - 5.1
LE version: 12.0.2

My box is connected via HDMI to the TV, my TV and my home theater are connected via HDMI ARC.

On version 12.0.1 the sound works correctly, but visual glitches that make viewing impossible.

feel free to tell me what additional elements I could provide, and how to do it

Some updates since my last try.

It appears that if i plug my box directly to my Home theater, the 5.1 is working as far as I limit the sampling to 48 kHz (probably the max accepted by my Home theater). I could keep this configuration but my Home Theater isn't compatible with 4K, such a shame

I gess, the problem come from a compatibility or setting with the TV, but I can't fine witch one. Do you have any clue ?

I have the same problem, with a similar setup. Kodi on an allwiner H6, connected to a Sony home theater via a Samsung TV with eARC enabled.

I'm totally sure the 5.1 was working fine before the update. I've tried a downgrade and a clean install, but nothing works.

Here is my Log