I agree with @Sticky_Situation and @RAyers.
The usual protocol at local CTs and Starter Trials is to offer “schooling SJ rounds” after your competition round; this allows you to troubleshoot if you had issues, and get another practice round under your horse’s belt without the pressure of it counting - a win/win.
It also allows the shows to make more money, pretty painlessly. People are more than happy to pay for the opportunity to jump around again and apply any necessary “fixes“, and since we are a one round and done sport, it also has the advantage of being more like a jumper show in that you get another course done at the same venue. This can be especially beneficial for green horses/riders (or for horses who are a little looky or backed off or have SJ issues in general), and riders who are looking to work out the kinks without getting an “unfair advantage“; this is not a sport where you are supposed to practice and work out the kinks before competing - the expectation is that you do that at home, or while schooling off property and/or going to schooling shows.
At the majority of HTs I go to in Area 2, cross-country courses are not open before the competition for obvious reasons!
Though it’s not necessarily dumbing us down (and transforming us into the “H/J model“), It still seems to run counter to the spirit of eventing, at least IMHO.