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Related to #10308, we might have legitimate changes in file size or generation. Those changes should not cause warn log lines. In order to detect changes of the generation number while the file size stayed the same, load the metadata that we store on disk on loading of the timeline. Still do a comparison with the on-disk layer sizes to find any discrepancies that might occur due to race conditions (new metadata file gets written but layer file has not been updated yet, and PS shuts down). However, as it's possible to hit it in a race conditon, downgrade it to a warning. Also fix a mistake in #10529: we want to compare the old with the new metadata, not the old metadata with itself.