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Interesting! And even more strange. In my case, both Core and webMathematica have the same version. Are you on Windows? I'm using Mac if it matters at all. What's going on here?
Wolfram Workbench has been (almost) abandoned by WRI, and was lagging terribly behind Mathematica. Now with Mathematica 13 and accompanying PacletTools, the situation has been improved significantly. These are what I have found so far from a few days...
@martijn Thanks for sharing your experience. To make the issue clearer, I had created a new discussion: https://community.wolfram.com/groups/-/m/t/2167323 I've put a brief remark there.