Steady Feet skill work on any knockbacks or not?

Does “Steady Feet: Allows player to withstand stronger attacks without being knocked down.” work in all situation when u can be knockdowned? e. g. grenade lauchers shock waves or stomp of tank and harvester or just when U can fall from bicycle?

The skill works for all attacks but the cluster granate launchers from Apo Hunters and Lyncs.
Maybe it is a bug or those attacks are too strong.

Since I don’t use bikes I have no idea whether the skill has any effect on them.