So i showed here how i created this file https://github.com/Martin15135215/git_ifc_test/blob/main/test_two_cube_wall_4d.ifc

The ifc file just has two IfcWall with the same geometry, just the second IfcWall is a bit displaced relative to the first IfcWall and only has three IfcTask:

First IfcTask: it construct the first IfcWall
Second IfcTask: it "moves" the first IfcWall to the second IfcWall
Third IfcTask: it demolate the second IfcWall

So when i load it in Blender it shows nicely my three ifctask:

And a nice gant chart:

First Task with PredefinedType CONSTRUCTION:

Second Task with PredefinedType MOVE:

Third Task with PredefinedType DEMOLITION:

And then i did this setting for animation:

So my question is, why is my second cube already visible at 2022-09-26:

I use the newset BlenderBim zip:

Edit: I am not sure, if that is a bug in BlenderBIM or my ifc file is false...