I am using Max 2024 and use Miauu's importer script. A critical step for me though is that I save down to V8 in sketchup first because that pushed the script to use the legacy importer which was still buried somewhere in Max. I do not necessarily get all lines, though, depending on how the SU is modeled.
Here's what I find in the Autodesk help file and I don't think 2024 is any different...I am using 2024 with similar results to what I was getting in 23, 22, etc...YMMV but might be worth a try if you are at a dead end.
Note: This importer is deprecated as of 3ds Max 2020.2 Update, and may be removed in a future release. It is replaced by the ATF-based ATF_SKETCHUP_Import importer. Since the new importer is the default for .skp files, you need to specify this importer with the using keyword parameter to importFile().