Splitting patterns breaks pattern automation placement. Merging patterns deletes all automation.
If you take a pattern which has automation and then slice it up on the timeline, the automation is not cropped/moved accordingly and no longer corresponds to the notes properly.
If you merge patterns all pattern automation is deleted.
If this worked as expected it would be a huge workflow imorovement for me as I do a lot of splitting and rearranging on the timeline.
(PS: apologies if I may have posted this before but cannot for the life of me find/bump it )