The main thing being said is there's a drastic difference between knowing the BI you're getting is temporary and it being a 'permanent' government program. There's no way to provide a citation for that because the only way to run that is to have a full UBI and study the results to see if these short term BI studies still hold water.
However it's not a stretch at all to say people will act different when they're temporarily receiving money than when they'll receive it 'forever'.
The main argument I, and I believe the OP, was making is because the period of these programs are limited, and not even the full period is guaranteed as this shows, it affects how people act. If it's a program I believe I can count on existing for 10-20 years I can make significant life changes around receiving the money, eg move somewhere super cheap and volunteer or something, but at just a few I know I'm going to have to go back to normal at the end so making those big changes is harder.
However it's not a stretch at all to say people will act different when they're temporarily receiving money than when they'll receive it 'forever'.