I didin't yet figure out any pattern for this happening, but it happened a few times so far while 'wind searching'. I don't recall this bug on the older hills, just noticed it at Oberstdorf.
Update.
When it happends, the speed indicator show 0.1 km/h all the time, at the inrun, during the flight, and after the landing. The following players have the same bug till the end of world cup. (don't know how it works in team cups).
It appears in the replay right after the jump. Gonna check it in the replay menu as soon as i get back home.
Didn't notice it on other hills before the update. Will do some more jumps to check it on Villach today.
Another thing to observe is to check if the bug appears in every jump of the competition starting from the first jump (or if it starts only later in the competition).
The bug does not appear when the replay is opened from the replays menu. It's only displayed in the replay right after the jump.
Still checked only Oberstdorf so far.