Segfault on updating foreign table

Hi there,

I tried to synchronize two tables on different databases using foreign data
wrapper. I executed update of foreign table with sub-query selection from
local table. As the result I got segmentation fault. General query:
UPDATE foreign_table SET (col) = (
SELECT col
FROM local_table
WHERE foreign_table.id = local_table.id
);

I am not looking for working or better solution, I just want let you know
about this. I think the query is according documentation and segfault is
not suitable result. If somebody could check it I would be grateful.

For reproducer or log see attachments.
Tested on Ubuntu 18.04.3 LTS with PG12: PostgreSQL 12.1 (Ubuntu
12.1-1.pgdg18.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
7.4.0-1ubuntu1~18.04.1) 7.4.0, 64-bit

Thanks for your time.

Best regards,
Lukas