Caption Keyboard Shortcuts for Split and Merge do not work
There are unmapped keyboard shortcuts for "Split caption segment under CTI" and "Merge selected caption segments." When mapped, they do nothing. I had previously added "Edit selected caption text," which operates correctly.
Methods that work as expected include the Split caption and Merge captions buttons in the Text Panel, and the razor tool and Ctrl+K (with the Caption Track targeted).
Note: I did find menu equivalents for some of the commands that have keyboard shortcuts under Sequence -> Captions. There are several commands there. But these are not in the list. Should they be?
Steps to reproduce:
1. Map the two commands above to Ctrl+Alt+Y (Split) and Ctrl+Alt+U (Merge) (Yes, remember to click OK.)
2. Place the CTI in the desired location; press Ctrl+Alt+Y.
3. Select two adjacent captions; press Ctrl+Alt+U.
Result: Nothing happens.
Expected: The caption under the CTI should split; the two captions selected should merge.
System info
Application: Premiere Pro (Beta) v15.4.0.12
OS: Windows v10.0.19041, RAM: 23.99 GB, CPUs (logical): 8

