When using the tiling option, the rose symbols are never updated
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havatv commented
Due to a QGIS bug (#13565: "modifying a svg already cached doesn't invalidate the cache, renders as version initially loaded during a session"), QGIS has to be restarted in order to clear the SVG cache. This means that the rose diagrams (that are stored as SVG files) will not be refreshed using the files on disk, but will use the first SVG files generated in the session.
A workaround could be to make the file names unique.
havatv commented
Fixed using unique file names. Files are not deleted (in order to allow the user to store the resulting rose diagram layer), so this fix results in significantly more files being left on the disk.