Probably inactivity didn't help, but the main thrust of last meal effect is something I would express differently.
As simply as I can manage, our bodies work on a routine. It gets used to when we get up, when we eat, sleep, work and whatever. As a part of that our digestions are similar. You know how it is, we probably get hungry about the same time each day, and so on. In the background, our digestive systems are geared up for food that mimics what we have been eating recently, and as such the required hormones and digestive enzymes are around and about. Where we then lump in something new, in any quantity, as you did with the pastry (but it could be fat, protein or anything really), our systems can be rather caught short and not able to digest it efficiently. Think (old life) Christmas dinner feasting, or the opposite of what happens with carb flu. With carb flu, the body is objecting to the reductions. With last meal effect, or as I call it in my head, "enzyme-lag", our bodies are caught short, and deal with it best they can, which can include increased blood readings.
If you were to repeat the same pattern today, you might find your score improved a bit, because your pastry wouldn't be a complete shock to your system, and repeated again, it could be better again. How much improvement any individual can expect ir really down to their own bodies, and the level of change they are imposing on their systems at any given time.
So, that's why you may observe folks on here advising not to count out or in and reintroduced food, based on on iteration.
It's completely up to you how you choose to handle your most recent "experiment" and the results, but please do bear in mind the concept, or you could find yourself repeated discounting foods when agreeing a window for modification with yourself might be kinder, physically and psychologically.
Good luck with it all.
