[Beta] and [10.0.5] fail to find open access papers

When adding papers from Researchgate, I often get an error when the original paper is provided by MDPI. I thought this was related to the strict IP control measures at work, and since I can still add the paper to my library manually, it is not a big problem.

However, I've been working from home this week (on personal laptop) and have seen the same issue. Again, it's not a huge problem, since I can just add the paper -- it's just an extra step. But when I select "find full text PDF", Zotero finds nothing, while I can follow the DOI in the parent item and download and attach the paper myself....

An example:
10.3390/pr13030613

Am I doing something wrong? (Very possible, still full of painkillers after operation...)
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