This was not a debug log so unfortunately pretty useless.
I'd suggest you do a different test, to check if the IR receiver sends proper input events (that's the lowest level we can look at).
First install the "System Tools" addon from the LibreELEC repository (it's in the "Programs" section).
Then ssh in and stop both kodi and eventlircd:
systemctl stop kodi
systemctl stop eventlircd
Now run evtest which should print a number of input devices together with their description. You probably have 3 from your Spinel Plus IR receiver, start with the "Keyboard" one, and test the other ones later.
Then press a "working" button, you should get some output on the screen like this:
Event: time 1584797019.747427, type 4 (EV_MSC), code 4 (MSC_SCAN), value 70052
Event: time 1584797019.747427, type 1 (EV_KEY), code 103 (KEY_UP), value 1
Event: time 1584797019.747427, -------------- SYN_REPORT ------------
After that press a non-working button, you might also see some screen output - please post it plus the info which button you pressed.
If you didn't get any screen output on a button press then it may be that it's delivered via one of the other input devices, so check them, too with evtest.
so long,
Hias