The Warlock has access to special forms for their find familiar spell through the Pact of the Chain feature. I’m wondering if these special forms, the Quasit, Imp, and Pseudodragon in particular, allow the player character to share the familiar’s Magic Resistance feature. In the Monster Manual each of these creatures has a sidebar that states that the familiar shares its Magic Resistance feature with the companion they are bonded to, but the PHB doesn’t mention this in any of the creatures’ stat blocks.
For example, in the Variant: Pseudodragon Familiar sidebar on page 254 of the MM it says:
“While the pseudodragon is within 10 feet of its companion, the companion shares the pseudodragon’s Magic Resistance trait.”
This feature seems clear in the MM but I’m led to believe that it wasn’t intended for Player Characters since mention of it is absent from the stat blocks in Appendix D of the PHB (pages 307-309).
Would a 3rd level warlock who chose one of these familiar forms through the Pact of the Chain feature benefit from advantage from saving throws from spells and other magical effects due to these special forms, or was this feature only meant for powerful NPCs and enemy spellcasters who had made this link with these familiars themselves?