Steps to reproduce

function foo { param($DebugBuild) }

1. Receive-Job -wa<TAB>
2. foo -D<TAB>
3. foo -Debug<TAB>

Expected behavior

1. Cycle through -Wait and -WarningAction
2. Cycle through -Debug and -DebugBuild
3. Cycle through -Debug and -DebugBuild

Actual behavior

1. Only completes -WarningAction
2. Only completes -DebugBuild
3. No additional completion