sorry for double posting, but i found a temporary solution: The problem actually comes from an incorrectly configured data recorder. In the ZIP-file of the project export, I could identify a .sqlite file with a uncompressed size of >1.2 gb in the .db subfolder. I deleted this from the zip folder and re-imported the project. Now it seems to work just fine again. One recorder was massively misconfigured: The retention time was set to 0... Now, the project can be opened in the Designer again! Nice!
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