Hey Flavien!
Thanks for the response and the explanation. I have faced ongoing issues with it since the date of my post, again on UE5.2 (So it is possibly just an experimental version issue/bug).
That said, I have tried basically every combination of imports/restarts and there seems to be very little consistency in what is actually triggering this behaviour.
Sometimes ill import files successfully, and an hour or two later go to reimport them (eg changed the res of the images) and they will all fail and the property will be empty.
Restarting the engine, or the PC, dosent guarantee to fix this, but it can sometimes do so.
As a result, there have been times where for almost the entire day/hours on end, I cannot import/reimport, no matter how many times I delete the pipeline asset and regenerate it, get sent clean versions of it, restart pc/engine, or what type of files I’m importing (being fresh new files to fresh folders, or reimports).
Fortunately since I posted, I’ve not had a day where its been a massive problem, but it is definitely still happening daily (it happened yesterday and restarting the PC + Engine) then replacing the references with DefaultTexturePipeline fixed it.
I would definitely appreciate it if you ask, like I said, it might just be a bug on my current version, but perhaps he has an idea of what might be triggering this and causing that property to become empty.
Thanks!