Unfortunately, those items that disappear in the cockpit are not the result of "dropping" LOD's, but "culling" of small objects. I have a couple tricks at my disposal to fix this, but unfortunately, I have no way of predicting which small objects will be just under this limit, or just over. As you can imagine, seeing my aircraft degraded like this in MSFS 2024 as a result of following the guidelines is quite disappointing. I'm going to take a pass at fixing these things by disregarding some of those guidelines for my SU4 round of updates to these aircraft.