The CJEU’s finding in Shell, was applied by the Court of first instance at Antwerp in a judgment from October last, which has just reached me. (I have not yet found it in relevant databases (not uncommon for Belgian case-law), but I do have a copy for those interested). The case concerned debunkered off-spec fuel, off the ship Else Maria Theresa (her engines apparently having been affected by the oil being off-spec), blended into /with a much larger amount of bunker oil.
The court applied the Shell /Carens criteria, leading to a finding of waste. In brief, the blending in the case at issue was not, the court held, standing practice in the bunkering /debunkering business, and /or a commercially driven, readily available preparation of off-spec for purchase by eager buyers. Rather, a quick-fix solution to get rid off unwanted fuel.
The judgment (which is being appealed I imagine) emphasises the case-by-case approach needed for the determination of ‘waste’. It relies heavily on (the absence of) evidence on market consultation and signals from interested buyers for the off-spec fuel.