I believe this occurred in the last update (5.1.50) It still isn’t fixed in the update released today (5.1.51)
I have the shortcut in the jump bar for “l,k” to be “lock key editor to selection”. This is really helpful for bulk editing midi cc or dynamics. It appears this command is no longer functioning in Dorico.
You’re absolutely right, and I’m sorry for the inconvenience caused. We fixed one problem involving independent voice playback and broke the standard case for non-independent voices. We’ll fix this as soon as we can.