Cutting expression clips in 8.5 using Break deletes all expression data
Since updating to 8.5 I am unable to cut expression clips without losing all my expression animation. When I attempt to cut an expression clip in two using Break in the right-click menu of a clip on the timeline the first half gets a strange new arrow icon and the second half loses all its data assuming a fully blank expression. All subsequent cuts are similarly blank. It does not appear to delete actual keys (since keys are still visible on the timeline), but all expression is gone.
For now I've resorted to exporting and re-importing the parts I want to cut as Motionplus clips using Collect Clip so as to avoid breaking everything by cutting normally. Needless to say this should not be necessary.