You are right it's probably the shock parts as those have slightly different processing when grouping etc. I'll try to reproduce it and fix it for the next version.
In the meantime you can probably avoid the problem by not putting (generated) template parts in groups and instead add their reference. You add the whole shock as one to a group during nesting mode by 'excluding' it. To do that click any of it's parts and click exclude selection from the menu or press 'e'. It will then behave as a single model / part again even during nesting.
In the meantime you can probably avoid the problem by not putting (generated) template parts in groups and instead add their reference. You add the whole shock as one to a group during nesting mode by 'excluding' it. To do that click any of it's parts and click exclude selection from the menu or press 'e'. It will then behave as a single model / part again even during nesting.