UPDATE
Until the Xara fix, the correction you can make suggested by @MB365 (Matt - Xara CEO):
What I had also tried was selecting the Block > Open Web Block, selecting the FlexGroup and do as above; finally, Ctrl+S to Save or Ctrl+W to Exit back to the main design page.in the Design Gallery, users can simply select the FlexGroup inside the Web Block using the P&L gallery and then turn off the Export as single image option in Utilities > Web Properties > Image tab.
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