2019 SP 5.0.
When exploding an assembly I'm not getting sub assy parts selected even if the box is checked to do so.
Can you provide more information or screen shots of your issue?
All I can think to add is this is happening on old assemblies being brought into PDM..
I'm not sure what else to tell specifically. The software isn't function as expected. Screen shots would be difficult to convey without understanding the context of the assembly.
Retrieving data ...