Strength workout in FTP Builder plan said for me to ride 260 watts for 10 seconds. Is it a problem if I hit over 800?

I just got this Kickr Core 2 a week or so ago. I did the first 4 "Getting Started" rides and then did a (20 minute) FTP test before I started FTP Builder.

With my FTP at 163 watts it said I should do "FULL GAS" maximum efforts for 10 seconds with ERG off. My first sprint I did like 400 watts or so immediately and let off. I felt bad because I didn't stay at 265. I kept ERG on for the next few sprints to "stay" at 265, but it didn't really feel like anything.

I just turned ERG off on the 2nd block of sprints and was at 700-800 watts, but they were FULL GAS sprints.

Of course, I didn't get stars on the workout for those sprints. Is that a problem? Is blasting past 265 watts a problem? I figure the prescription of 265 is what I should stick to, but FULL GASS is way too hard to peg a precise wattage and keep it there for 10 seconds, so I figure getting those stars doesn't matter.

Are people able to peg a precise wattage in a max sprint for 10 seconds?