Find Usage not working after renaming variable

Hello guys,
Find usage works fine before renaming variable. That is what I have after pressing Alt + F7:
find_usage1.png
But after manual renaming of variable, my plugin won't find usages:
find_usage2.png
Does anyone know why this happens? This is looks like some sort of indexing or caching issue, but I don't use caching for now.
Thank you

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