dolt_diff with commit_hash filter errors with result max1Row iterator returned more than one row

[jycor]

Repro:

create table t1 (i int primary key);
create table t2 (i int primary key);
call dolt_commit('-Am', ',');
select * from dolt_diff where commit_hash = <...>

Interestingly, this only happens when connecting to a dolt sql-server and not through the dolt shell