I experienced this problem in patch 8.9 but I forgot to report it and I wrote 8.10 because I don't know if the problem still persists.
So, I was playing a game with **Zoe** and I received a remnant of an item for my W, this item was **Shurelya's Reverie/Crest** but instead of showing this, the name that appeared in my W was "**Spell not found: game_spell_tooltip_ShurelyasCrest**" and the item's image that appears next to Zoe's Health Bar was **Timeworn Talisman of Ascension**. There were recent updates concerning these items so I guess it is something missed in the hurry, there might be some more omissions, if items' names have received updates after Zoe's release.
Match Details: https://riot.com/2GXsUu1
Type of Bug: **In-game**
I hope I was able to help you.
Have a nice day!