Raspberry Pi 4+TV hat+LibreELEC-RPi4.arm-9.1.502+Kodi 18.4 (Linux Kernel 4.19.x) having HTS Tvheadend 4.2.8-27 ~ LibreELEC Tvh-addon v18.104.22.168
On default installation, the recording failed due to non-existing recording directory /storage/recordings which is by default defined in Configuration/Recording/Default profile/Recording system path.
I think that the best option would be if TVheadend automaticaly create the directory, autoselect some that exist (in my case /storage/tvshows) which would prevent failures. If really not possible, then user should be invited to select the directory among existing ones during installation.
Nothing-saying general status "Time missed" on failed Recordings tab. Should be able to be clicked or the red erroneous icon to show mouse hover menu or the info box with more details about exact cause of the recording failure (ie: TVheadend recordings save path does not exist, you have to create it or change it in configuration)