Model display is strange when memory limited is given in Autodesk Forge-Viewer

Some components are hidden when memory limited are added.
Select a node with memory limited attached to the Autodesk Forge-viewer.
some of the unselected nodes will be hidden.
This happens on both PC and iOS.

Before select

After select

This IFCmodel create by Rebro.
I’ve tried some other model, but All with the same result.
The memory Limited are configuration as follows.

loaderExtensions: {svf: “Autodesk.MemoryLimited”,},
memory: {
limit: 2560,
},

We checked both 7.4 and 7.63 versions of the viewer and this occurred in both

Do you know how to deal with this problem?