Plywood offcut and hide it with the bed. It's temporary and hidden so don't waste time and money on it?
Did think on that, but will need to make good and level to fit new floor in time so not wasted. A bag of cement and sand isn't much, seems easiest.
You could always put a silicone bead around the current cutout and maybe a layer of something so that if you need to pry it up down the line it'll be a bit easier.
But when you remove the old floor the rest of the room will be lower than the bit you concreted.. unless you plan on just flooring ontop of if all
@skinny started
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Plywood offcut and hide it with the bed. It's temporary and hidden so don't waste time and money on it?