Hi, @BLUEFROG .
Please don’t get me wrong, but I see that only a specific sentence of my comment was addressed, as if it was the only thing I had written. It gives me the impression everything else that I wrote was disregarded. 
Please note that I don’t have an expectation of getting immediate replies here. It’s preferable to wait but seeing the comment lead to a constructive and productive conversation.
I think that the fallback to a bookmark would be appropriate there wasn’t something better that DEVONthink could do.
And as I said, I believe a retry strategy is more appropriate than saving in a format that the user doesn’t want. The downside of that is probably just a few extra seconds.
The current behaviour is analogous to ordering a meal at a restaurant, and when the chef is preparing a dish, he/she uses the wrong ingredient, and decides carry on preparing a completely different dish.
Surely the right thing to do would be to prepare the meal that the customer wants!
Even if that was the case (nothing better that DEVONthink could do), it would also be very useful if it informed the user that the item was saved in a different format.