Android Room data modeling with embedded FKs

I'm trying to represent the following entities:

• Warning: A warning entity with a unique id, title, subtitle, and up to 6 actions (below)
• Action: An action entity with a unique id, text, icon, etc. relevant to zero or more warnings

Examples of this relationship would be:

• Missile Lock warning with actions Evasive Maneuver, Release Chaff, and Deploy Flare.
• Incoming gunfire warning with actions Evasive Maneuver, Return Fire, and GTFO

Here's what I have:

The Warning entity

@Entity(tableName = WARNING_TABLE, 
        indices = [Index(unique = true, value = [WARNING_TITLE, WARNING_SUBTITILE])]
       )
data class Warning(
        @field:PrimaryKey @ColumnInfo(name = WARNING_ID) var id: String,
        @ColumnInfo(name = WARNING_TITLE) var text1: String,
        @ColumnInfo(name = WARNING_SUBTITILE) var text2: String?,
        @ColumnInfo(name = WARNING_ACTIVE, defaultValue = "0") var active: Boolean = false
)

The Action entity

@Entity(tableName = ACTION_TABLE, 
        indices = [
                    Index(unique = true, value = [ACTION_TEXT]), 
                    Index(unique = true, value = [ACTION_ICON])
                  ]
        )
data class Action(
        @field:PrimaryKey @ColumnInfo(name = ACTION_ID) var id: String,
        @ColumnInfo(name = ACTION_TEXT) var text: String,
        @ColumnInfo(name = ACTION_ICON) var icon: String,
        @ColumnInfo(name = ACTION_ICON_SRC, defaultValue = "$DRAWABLE_SOURCE_RESOURCES") var iconSrc: DrawableSource? = DrawableSource.Resources
)

... and the table that links the two, the warning_action table:

@Entity(tableName = WARNING_ACTION_TABLE,
        primaryKeys = [WARNING_ID, ACTION_ID],
        foreignKeys = [
                        ForeignKey(entity = Warning::class,
                                   parentColumns = [WARNING_ID],
                                   childColumns = [WARNING_ID],
                                   onUpdate = ForeignKey.NO_ACTION,
                                   onDelete = ForeignKey.CASCADE),
                        ForeignKey(entity = Action::class,
                                   parentColumns = [ACTION_ID],
                                   childColumns = [ACTION_ID],
                                   onUpdate = ForeignKey.NO_ACTION,
                                   onDelete = ForeignKey.CASCADE)
                      ],
        indices = [Index(ACTION_ID), Index(WARNING_ID)]
)
data class WarningAction(@ColumnInfo(name = ACTION_ID) val action: String,
                               @ColumnInfo(name = WARNING_ID) val warning: String)

Now what I want to do is to be able to load a list of all Warnings and their associated Actions (or a Single warning and its associated actions).

This is what I have so far, but it isn't working:

data class WarningWithActions(@Embedded val warning: Warning,
                              @Relation(parentColumn = WARNING_ID,
                                        entityColumn = ACTION_ID,
                                        associateBy = Junction(WarningAction::class))
                              val actions: List<Action>){
    val id get() = Warning.id
}

... and in the DAO:

@Query("SELECT * FROM '$WARNING_TABLE' WHERE $WARNING_ID = :id")
fun load (id:String): Maybe<WarningWithActions>

I also tried:

data class WarningWithActions(@Embedded val warning: Warning,
                                    @Relation(parentColumn = WARNING_ID,
                                        entity= Action::class,
                                        entityColumn = ACTION_ID,
                                        associateBy = Junction(value = WarningAction::class, parentColumn = WARNING_ID, entityColumn = ACTION_ID))
                                    val actions: List<Action>){
    val id get() = warning.id
}

I get an empty list of actions and I'm pretty sure I'm missing something that tells room how to get those, but I can't figure out what I'm missing here.

I've already used Database Inspector and verified that the actions exist, the warnings exist, and the link entries in the link table also exist.

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