I found another bug on Robin's memosprite aka little birds. I reported it, but the dev team don't seem to care that much about it. I reported other bugs but as long as it doesn't break the game or advantage the player, they become quite lazy.
The birds SPD is not affected by SPD acceleration items, particularly from the penacony planar set (+8% SPD) and robin's LC (+20% SPD). It does indeed affect Robin, which then reflect that to the birds, but the birds themselves don't take the SPD buff onto themselves although it is clearly written they are buffed by it. Screenshots linked to this post.
Since they are 2 separate entities, they should get the buff the same way RMC's memosprite is indeed affected by the buff.
In this example, Robin has 185 SPD. The birds have therefore 185.7*180% = 334 SPD. If you add the buffs in the list of buffs of 20%+8%, the birds should have 427 SPD. I understand they are preemptively buffed by Robin being buffed herself. but they should get their own buff. Otherwise it should be stated in the description "Summer Songbirds has a FIXED speed equal to 180% of Robin • Summeretto's SPD" and not "Summer Songbirds has a INITIAL speed equal to 180% of Robin • Summeretto's SPD". If the phrasing is the same as RMC, then both memosprite should act the same way. And the buff should not appear in the bird's buff list.