I just found out this weird behaviour (I have complained in the past about stuff with duplicate patterns / clip aliases but this is a real bug imo)
Select all patterns in seq, right click, Organize=>Join.
Instead you get
merge of 
Is it embarrassing i didn’t know how to do that with the later versions? But then again I never really repeat patterns personally…
Anyway bug confirmed! Seems to happen whenever you have the same pattern more than once but symptoms can vary. EG if your pattern is  then the join seems to be  rather than . I think a repeated pattern does have to be the first in the selection though…