I have 2 home assistant systems and they show different attributes of a identical entity (door sensor).
Is there any setting in home assistant to limit showing the attributes of an entity?
Are these devices set through ZigBee2mqtt or some external add-on? Maybe, it is where you define which attributes to expose.
They are all connected through Zigbee2mqtt.
In the Zigbee2mqtt web control panel, click on the device and then the “Exposes” tab for each device. What do you see?
All the attributes can be seen iin the Zigbee2mqtt as shown below.
Due to not shown attributes, the code which extracts low linkquality of sensors doesn’t not work 
Go to the device page in Home Assistant and enable the disabled diagnostic sensors.
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but, this would enable the sensors, it wont fix the missing attributes, right?
Yes. There is a move away from attributes to individual sensors. So the question becomes why are they appearing as attributes of the first sensor.
Was it a manually created mqtt sensor?
Thank you.