Allays will sometimes push players when flying around, which can knock them off of scaffolding or platforms. Although this is technically intended since most entities can push most other entities, it makes Allays more difficult to work with since they can end up being more of a liability then a help.
MC-253099
Allays can push players
Resolved
Works As Intended
2
I can confirm this behavior, but this is highly likely to be intended, as this is just entity collision working as it should. On another note, this report could be considered a feature request.