iOS BLE peripheral connection loss

Hi, I have a certified and qualified BLE device that is a Central role. When I try to connect it to an iOS device as a peripheral (using 3rd party application such as nRF Connect) I am able to create pairing and bonding, but for some reason the iOS device disconnect immediately after the encryption and authentication process success. I have heard one explanation for this issue, but I haven't found it in any documentation: iOS device as a peripheral will disconnect if he sees that there are no requests from the Central side. is it true? I would be happy to be inferred to the relevant documentation about this issue. Thank you

iOS BLE peripheral connection loss
 
 
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