Looks like you have a nice deep pan and you can pull that hole forward if you don’t have a touch hole liner already. but if it works leave it. Just a little powder beneath the touch hole unless you don’t mind the additional delay and swoosh bang. I think we all learn that eventually. I had purchased a pedersolli Charleville with a flash hole in almost the same location a bit too far aft it still fired. Even though it fired fine it bothered me lol. So I ordered a few different liners, I ended up using a white lighting I think. Which ever one I used matched the barrel steel in color that was not planned just worked out that way. The barrel is round on that flinter. You can get some wide touch hole liners. Pendersoli beryllium being the widest I found metric thread also I think. Heck you could make your own. I took a 3/32 pin router and pulled the hole forward and then using step drills opened it up to the tap size, tapped it, and presto you would never know it’s there more importantly corrected. Went in through the but end with a small round rifle file to take down the liner to match the barrel thread height so jags can get to the face of the breach plug. a drill bench to keep bits from walking is the way to go. Actually pretty simple to do just have to be comfortable doing it.I recently bought a rifle I was concerned about with the same issue. I have only had one miss fire after sending countless balls down range.
RM