All my problems with Mango are gone since 3.211.
I am using it in WDS mode.
Thank you @alzhao.

Only thing I additionally had to do to avoid problems was to set Country and Region on Mango to Germany, as German AVM routers also are allowed to use channel 12+13, which is default off on mango.

I did this via console:
uci set wireless.mt7628.country=‘DE’
uci set wireless.mt7628.region=‘1’
uci commit wireless
wifi

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