I added a self made anti-robbing screen and this is a result.It seems as if some attempt against the hive is going on.
You may want to reduce the entrance even more.
Or put up a screen (google anti-robbing screen).
I have taped the entrances with good outcomes in the past - painter's tape with just a small knife slit.
The resident bees will chew through to make an appropriate entrance; meanwhile the outsiders will not get inside at all.
Not a major case though - not many killed bees under the entrance.
But a preventive move maybe warranted.
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