WDS stopped working in 21.02, looking for bug in netifd, how to patch?

[Daniel Haid]

> There is a race condition between hostapd and netifd.

Now that the bug is found, I could try to write a patch. But I do not 
know what the correct behaviour should be.

Should netifd not add wlan0.sta1 to the bridge at all? If so, what is 
the best way to implement it?

Or should hostapd be patched not to treat it as an error if wlan0.sta1 
is already added to the bridge?

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D.H.