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There have been a lot of similar reports about audio problems after latest update. The issue affects ALSA audio for Intel Skylake (6th gen) to TigerLake (11th gen) systems with LTS kernels v5.10 and v5.15
Many users have confirmed that the best, simple solution for this is to install kernel v6.0 using either Manjaro Settings Manager GUI tool, or copy/paste this to terminal
sudo mhwd-kernel -i linux60