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I don’t know for sure what it said originally, but I suspect "detected" was added.

The original text was

The rakshasa is immune to spells of 6th level or lower unless it wishes to be affected.

I tend to agree with this interpretation. So to answer your question,

I tend to agree with most of this interpretation, although Counterspell seems to be up for debate, and Shield probably wouldn't work, since although it's defensive, it is a spell effect that has a duration. So to answer your question,

Unofficial designer tweets

• Q - Does a Rakshasa’s ‘Limited Magic Immunity’ protect it from weapons enhanced by Shillelagh?
• A - Shillelagh and magic weapon are spells. Limited Magic Immunity prevents a rakshasa from being affected by spells of 6th level or lower, unless it wishes to be. - JC
• Q - If I use divine Smite on a Rakshasa who has limited spell immunity, does he take any damage?
• A - don't believe it would be immune, since spell is affecting your weapon, not targeting rakshasa. - MM
• Q - Rakshasa can pass through Wall of Stone? It is immune of a Fire Elemental conjured by a 5th level Conjure Elemental?
• A - Because of the Limited Magic Immunity trait, a rakshasa could stroll through the wall created by the wall of stone spell, but not if the wall becomes permanent and nonmagical (aka undispellable). - JC
• A2 - A rakshasa's Limited Magic Immunity offers no protection against a summoned creature. The creature's presence is a spell effect. The creature itself is not a spell effect - JC

Unofficial designer tweets

• Q - Does a Rakshasa’s ‘Limited Magic Immunity’ protect it from weapons enhanced by Shillelagh?
• A - Shillelagh and magic weapon are spells. Limited Magic Immunity prevents a rakshasa from being affected by spells of 6th level or lower, unless it wishes to be. - JC
• Q - If I use divine Smite on a Rakshasa who has limited spell immunity, does he take any damage?
• A - don't believe it would be immune, since spell is affecting your weapon, not targeting rakshasa. - MM
• Q - Rakshasa can pass through Wall of Stone? It is immune of a Fire Elemental conjured by a 5th level Conjure Elemental?
• A - Because of the Limited Magic Immunity trait, a rakshasa could stroll through the wall created by the wall of stone spell, but not if the wall becomes permanent and nonmagical (aka undispellable). - JC
• A2 - A rakshasa's Limited Magic Immunity offers no protection against a summoned creature. The creature's presence is a spell effect. The creature itself is not a spell effect - JC