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I've been able to solve it on my part. This turned out to be an user error. I have WiFi Mesh on the same network with the wired backhaul. In some very specific conditions I've noticed that sometimes there had been up/down events on the interface connected to the unmanaged ethernet switch with loop detection. One of the WiFi APs had been connected via this switch. This pointed me towards the probable cause of the drops, and I've enabled Spanning Tree Protocol on the bridge interface. Since then I have 0 errors on the bridge.
I just wish there had been an easy way to just know what is the reason of the error in the first place.

I know that it's not a switch and I'm accepting potential downfalls of using software bridge as a switch. However I don't understand why should I expect lost frames regardless of the load? Also I don't see actual lost frames anywhere. When I stress test using iperf I'm yet to see a single dropped frame. That's why I'd like to know where does those errors actually come from.

I have CWWK device with 6 Intel i226-V NICs, with 5 of those configured as a bridge. I don't have VLANs in my setup and also see the Errors Out on the bridge interface. Network conditions do not seem to affect it and it constantly around 0,4% - 0,5% of the total packets out. Any hints on how to debug it would be much appreciated