A 747 tail taxiing through the glideslope is different from an airplane taking off going through the localizer beam.
The glideslope disturbance is much closer to the antenna so will be a lot stronger.
Also you need to differentiate between the sensitive and critical areas. Or whatever the nomenclature is.
With the 747 in the glideslope the ILS is basically unusable.
With the aircraft taking off crossing the localizer beam the disturbance should be short and less severe.
(So the real important areas were still protected in Munich while that was not the case in HKG
Just wanted to point out the difference)
Anyway while we are on the topic i'll add another incident:
My guess would be that the 747 Air China Cargo that had a runway excursion / go-around at Chicago O'Hare was the same situation as Munich.
(
Incident: China Airlines B744 at Chicago on Jun 21st 2018, veered off the runway and went around)