After the restart of a master switch it does not respond to SLAVE_PRESENT messages

Sometimes after the restart of a master switch it does not respond to WR SLAVE_PRESENT messages. After 4 messages are sent by a slave, the slave timeouts and degrades to PTP only (EXT_OFF).

All the time including the time between WR SLAVE_PRESENT messages are sent, there is an exchange of LLDP frames and other PTP messages (see the attached screen from wireshark).

During the testing VLANs and SFP DOM options were enabled in dot-config.