to_tsvector() chopping off trailing 's' characters

[Wells Oliver <wells.oliver@xxxxxxxxx>]

I don't understand this behavior in 12 (worked in 9.6), but:

select 'Thames', to_tsvector('John Thames');

Gives you a vector of: 'john':1 'thame':2

And searching for the full 'Thames' returns no results.

What's happening here?

--

Wells Oliver
wells.oliver@xxxxxxxxx