Comment 10 for bug 2006517

Are you sure the function is lost? Looks like the Adv Monitor is running even the features callback returns an invalid value.

Feb 07 23:50:34 ubuntu bluetoothd[1562]: src/advertising.c:read_adv_features_callback() Failed to read advertising features: Not Supported (0x0c)
Feb 07 23:50:34 ubuntu bluetoothd[1562]: Adv Monitor Manager created with supported features:0x00000001, enabled features:0x00000001, max number of supported monitors:32, max number of supported patterns:16