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@coast_turtle
As mentioned above, it depends on the diameter of the inner slot on the dropouts. The ENVE G series gravel fork (for 12x100 hub) for instance has dropouts that accept a 15mm hub end cap with a wider diameter when using the 15mm to 12mm adapter sleeve. Some Ritchey forks have swappable dropouts and because of this modularity they take a 15mm hub with either dropouts (with the 12x100 dropouts the reducer sleeve is required and with the 15x100 dropouts, obviously without a sleeve). There might be others, too, but these two are the ones I'm aware of.
Tbh, I find this a real PITA. Currently waiting delivery of a frameset which comes with a carbon fork specced for 12x100, fingers crossed it has the wider dropouts so I can use my 15x100 SON 28 front wheel with the sleeve.
If not, I do have a pair of spacers which came with a rear boost hub adapter kit I got off aliexpress (2 x 3mm spacers with an inner diameter of 12mm and outer diameter of 19mm) and which I've filed down to about 1.2mm of thickness. I used these on another fork when I found out that the old shitter precision 12x100 hub had end caps with 21mm outer diameter (essentially the diameter of a 15x100 hub) even though it was 12mm inner diameter, so it didn't fit together with the dropouts on that particular fork without placing those spacers on both sides of the hub. I did end up buying a new thru-axle with a longer threaded section just to have slightly more threads engaged because of the ~2.5mm wider hub spacing due to the extra spacers. Worked fine many thousands of km, nevertheless.