It looks something is wrong as on the same RPi 4B HW configuration running LE 9.80 nightly (even latest 20201124) the tvservice command does not find any HDMI display connected in comparision with LE 9.2.6 official so it can't be used on LE 9.80 at all.
LE 9.80:
LE:~ # tvservice -l
0 attached device(s), display ID's are :
LE 9.2.6:
LE:~ # tvservice -l
2 attached device(s), display ID's are :
Display Number 2, type HDMI 0
Display Number 7, type HDMI 1