Your condition is off and will always be true on category pages due to how logic operators work.
This might be more clear if I write what is happening like this:
is_category() || ( is_tag() && $query->is_main_query() )
Once is_category() is determined to be true the rest of condition doesn’t matter.
You should be more precise with your logic, along the lines of (brackets matter!):
$query->is_main_query() && ( $query->is_category() || $query->is_tag() )
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