This was raised on FB the other day, and I have the same problem, even after a RTFS.

Load _HOMESCK Style
Replace RealDrums with any other drums track (Find a Sub for RealdDrums)
BIAB shows the new style
Regenerate track
the original (congas) drums track still plays
change to any other drums track - the same, it shows the new drums but plays the original one

Track is not frozen.

Even if I then select a new guitar track, the new guitar track will play but the original (congas) drums still plays....

Not sure if this was already raised with Support...

I did the same with style _OLDRAFT and it worked fine....