When I check "KB4576946" or "KB4576483", "KB4486153" (.net 4.8) is automatically unchecked. Vice versa is true also, when you check "KB4486153" again, either of the other two that are selected are automatically unchecked.
After doing an install with the resultant ISO (with "KB4576946" checked), .net 4.7 is what is installed instead of 4.8 and WU installs KBKB4577324 (which contains KB4576946 and KB4576949 - the latter being for .net 4.7 is the one that is actually installed).
After doing an install with the resultant ISO (with "KB4576946" checked), .net 4.7 is what is installed instead of 4.8 and WU installs KBKB4577324 (which contains KB4576946 and KB4576949 - the latter being for .net 4.7 is the one that is actually installed).