Thanks for testing a different HDMI cable!
It's also possible that the system is waiting for network connection, before CEC gets initialized.
Code
Feb 16 19:11:02.128342 KodiSZ connman-vpnd[327]: wlan0 {create} index 3 type 1 <ETHER>
Feb 16 19:11:02.128414 KodiSZ connman-vpnd[327]: wlan0 {update} flags 4099 <UP>
Feb 16 19:11:02.128613 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 address B8:27:EB:9B:B6:B7 mtu 1500
Feb 16 19:11:02.128650 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 operstate 2 <DOWN>
Feb 16 19:11:02.129965 KodiSZ connman-vpnd[327]: lo {newlink} index 1 operstate 0 <UNKNOWN>
Feb 16 19:11:02.130135 KodiSZ connman-vpnd[327]: eth0 {create} index 2 type 1 <ETHER>
Feb 16 19:11:02.130183 KodiSZ connman-vpnd[327]: eth0 {update} flags 4098 <DOWN>
Feb 16 19:11:02.130229 KodiSZ connman-vpnd[327]: eth0 {newlink} index 2 address B8:27:EB:CE:E3:E2 mtu 1500
Feb 16 19:11:02.130264 KodiSZ connman-vpnd[327]: eth0 {newlink} index 2 operstate 2 <DOWN>
Feb 16 19:11:02.130393 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 address B8:27:EB:9B:B6:B7 mtu 1500
Feb 16 19:11:02.130425 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 operstate 2 <DOWN>
Feb 16 19:11:02.139523 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 address B8:27:EB:9B:B6:B7 mtu 1500
Feb 16 19:11:02.139565 KodiSZ connman-vpnd[327]: wlan0 {newlink} index 3 operstate 2 <DOWN>
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If you don't need WiFi, disable it on LE's settings.
If you have specific Ethernet settings for LE on your router, check them.