Quick navigation to Wave 1, 2 and 3 doesn't seem to work after clicking on Wave 1 one time (e.g. https://grandorder.gamepress.gg/p/illya-s-karakuri-castle-walkthrough#walk1, then either #walk2 or #walk3 fails)
Being able to sort these by CE/Drop would be helpful, especially when checking which ones we can get enough copies to Max Limit Break
Quick Navigation links to DayX appear broken (e.g. fgo-arcade-collab-walkthrough#walk2) doesn't jump to the appropriate day
Maybe late to the party, but on step 21, Chapter 4-1, 4-4-4 layout is kinda incorrect because they will summon another one if you didn't kill them all, so if you kill them all at once you only need to deal with normal 3-3-3 layout
"Actress" is low by 1 for Skeleton, Undead and Demonic for the Locator's numbers; should be 4, 7 and 8 respectively. (Could go Soldier to 4, too?). Forgive me if I'm wrong.
Oh you might actually have done the Okeanos node (Free - Storm Lv85) instead of the London node (Free - Mage Lv80), since the Okeanos node is the silver currency node. I almost did this too since the last Main Quest you do ends on Okeanos, I'll add a note that says this should be on London and not Okeanos.

You are correct, I indeed missed that detail!