Hi Tomas, thank you for your help! @Michael it looks like 15 repeats is not enough to say it is "reliably" reproduced: hope this does it.
To reproduce, be sure to start postgres from scratch. Load the dump file (below). And then run the following to reliably reproduce the error:
select id from natica_hdu_test WHERE "dec_range" <@ '[88.9999998611111,90.0000001388889)';
It was bugging out with an empty table but it seems intermittent. A successful query followed by the one above will not fail sometimes; hence the need for a from-scratch startup instance of postgres.