Out of interest could you post what your configuration is in calibre 7.26 for collection management; it would allow someone to replicate your environment and the 7.26 to 8.2.1 upgrade to try to understand what happens.
What would be best is both a copy of the calibre startup log when running in debug mode (this would show what plugins and versions are installed) plus screenshots of all the config screens from both the native Kobo Driver and the KTE driver.
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