Unexpected "cannot switch local execution status" error when querying two different dist tables

```sql
-- single node, fwiw

create table d1(a int);
create table d2(a int);
SELECT create_distributed_table('d1','a');
SELECT create_distributed_table('d2','a');

begin;
select * from d1;
explain select * from d1;
select * from d2;
ERROR: cannot switch local execution status from local execution required to local execution disabled since it can cause visibility problems in the current transaction
```