Executing UPDATE statement with subquery results in UNAVAILABLE error

Executing the following simple UPDATE statement stalls out and then results in an UNAVAILABLE error. The same statement executed fine on Cloud Spanner. I slimmed down the subquery to what I found to be the minimal example that reproduces the issue, so it's somewhat nonsensical.

```sql
UPDATE Requisitions
SET State = 5
WHERE
State IN (1,2)
AND EXISTS (
SELECT
MeasurementId
FROM
Measurements
LIMIT 1
);
```

The following similar queries don't have this issue:

```sql
UPDATE Requisitions
SET State = 5
WHERE
State IN (1,2)
AND EXISTS ( SELECT TRUE );
```

```sql
UPDATE Requisitions
SET State = 5
WHERE
State IN (1,2)
AND EXISTS ( SELECT FALSE );
```

Emulator version: 1.5.32
Spanner JDBC version: 2.21.0
Java Spanner version: 6.74.0

Attached stack trace.

[stack-trace.txt](https://github.com/user-attachments/files/20236681/stack-trace.txt)