About your original problem, after reading the whole topic, I tried a few things…
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I changed a single letter of my user, with the wifi activated, obviously he could not login but the OpenHAB app was still working via the local url. When I disable wifi, openhab didn’t work at all.
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with the wifi disabled, I went to shortcuts and did not see my items (same as you).
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when activating the wifi I discovered that although the openhab app shows my items again, the shortcuts app does not, so I think it is an authentication problem, maybe some typo in the user or pass?