Promoted properties in a batch

I have a batch of n messages. I use Property schema (“MessageContextProps“) . All fields got promoted except one. It promotes only 1 out of 5 messages (if I have 4 messages in a batch this field got promoted only in one message, if I have 10 messages – 2 messages promoted this field etc.)

All other fields have no problems. I tried change the data and order of messages. Is there some property that I can change? (In Rec. Location there is default batch size=20)

Thanks,

AP