Update does not move row across foreign partitions in v11

I've set up 2 instances of PostgreSQL 11. On instance A, I created a table
with 2 local partitions and 2 partitions on instance B using foreign data
wrappers, following https://pgdash.io/blog/postgres-11-sharding.html.
Inserting rows into this table works as expected, with rows ending up in
the appropriate partition. However, updating those rows only moves them
across partitions in some of the situations:

- From local partition to local partition
- From local partition to foreign partition

Rows are not moved

- From foreign partition to local partition
- From foreign partition to foreign partition

Is this the expected behavior? Am I missing something or configured
something incorrectly?

Thanks,
Derek