Hi Andrej Shadura, I have check all dependencies of matrix-synapse package.
All packages come from Debian Bullseye Backports and Main or Security (no Tiers).
The problem came from upgrade matrix-synapse at 1.61.0-1~bpo11+3 version to 1.63.0-1~bpo11+1 version.
As follow /var/log/apt/history.log Upgrade: matrix-synapse:amd64 (1.61.0-1~bpo11+3, 1.63.0-1~bpo11+1) Thanks a lot. Have a nice day.Maybe this link can help you : https://github.com/matrix-org/synapse/pull/12478
