Also, check if your hash does not contain the property that can be changed.
Oligarh
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Probably found the solution here. https://stackoverflow.com/questions/68267542/firebase-messaging-unregister-notification-for-read-timeout-failed
Also getting the same message. Don't know where it happens.
2021-08-31 10:35:14.730395+0300 oll.tv[16191:2325799] [connection] nw_endpoint_handler_set_adaptive_read_handler [C9.1 142.250.180.206:443 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, dns)] unregister notification for read_timeout failed
2021-08-31 10:35:14.730701+0300 oll.tv[16191:2325799] [connection] nw_endpoint_handler_set_adaptive_write_handler [C9.1 142.250.180.206:443 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, dns)] unregister notification for write_timeout failed