Press Alt+a to agree to the license terms and conditions
Switch to any other window
Switch back to HotKeysRepro Setup window
Press Alt+a to deselect license checkbox
Describe the behavior you expected and how it differed from the actual behavior.
Step 5 above in Steps to Reproduce should deselect the license checkbox. Instead the license checkbox remains selected. This behavior is also seen with all other accelerators (hotkeys) on the window.
A workaround is to press tab between Step 4 and Step 5 above.
I built the HotKeysRepro project with WiX 3.11 and found the behavior to be different. Alt+a moves the focus to the "I agree to the license terms and conditions" text but the checkboxk is not selected or deselected. You have to press space to select/deselect the checkbox. You sill have to press tab after switching to any other window to get any of the other hotkeys to work.
The reported expected behavior is to be able to press Alt+a (or any other accelerator) directly without needing to press tab or space or any other character combo.