Some airborne moves, such as air throws, will apply unactionable landing recovery which overrides the standard landing recovery. This recovery does not have a unique animation, and the length of time the character is unactionable depends on the move used. This is noted in the +(X)L part of the frame data, where X is the length of such type of recovery.
Some aerial moves like Eustace jU have landing recovery that is currently not represented.
Reference: http://www.dustloop.com/w/GBVSR/Mechanics#Landing_Recovery
https://github.com/agersant/gbvsr-frame-meter/assets/817256/01f2707f-0557-4037-979e-1103e35cbc75