selects with subquery doesn't show any fields when cached

[readyset-railway]

Expected behavior

Actual behavior

Steps to reproduce

CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES(1),(2),(3);

select * from (select max(a) from t1 as a) ss;

CREATE CACHE FROM select * from (select max(a) from t1 as a) ss;

select * from (select max(a) from t1 as a) ss;

ReadySet version

359b727a7c016c3975ff946201cd9a48f215f448

Upstream DB type and version

Postgres 16