Ran into a situation I haven't seen.

Our company now wants the order number of each job in front of the part numbers.  We have a starter we use and at the end of the job we use Pack N Go to add the prefix to the part numbers.  The first time I did this I had all my assembly drawings complete and all BOMs were formatted and dissolved as necessary.  Once the name change happened every BOM on each drawing went back to normal.  Everything un-dissolved and the row height completely changed.  This can be replicated each time.

Is this a bug or a new feature that I'm not using correctly?

We're using SW 2015 SP4.

thanks for any advice