Maybe you have a look at this thread. I had similar problems and created a quick fix.
Perhaps Daniel may verify if my way to solve it is correct.
OLDMACILLI_QuickFix_BBCSO_Harp_TubularBells.zip (3.28 KB)
OLDMACILLI_QuickFix_BBCSO_Unpitched Percussion.zip (3.66 KB)