Yes, we’re aware of the problem and we’re working on a solution. I’m sorry about this. Please note that the auto-assembly issue is not what this thread was originally about and not what my “fix is now in place” message above was referring to.
In the meantime, you are able to manually assemble mixed/multipacks. We know this takes a bit more time to do in comparison to the one-click button, but it shouldn’t be too much longer before we have the fix in place.
Please see How to assemble or disassemble products to find out how to do this manually.
Apologies again for the issues we have encountered today.