Query Editor and SELECT output in transaction

Hello,

I want to test a simple update statement on pgAdmin (4.16 in a docker
container).
I'm running this update between BEGIN and ROLLBACK to not alter database
content:

BEGIN;
UPDATE ---;
SELECT ---;
ROLLBACK;

But pgAdmin does not print anything in the "Data Output" tab.
Is it a normal behaviour ?
If I remove BEGIN and ROLLBACK, then the SELECT statement is correctly
printed.

Best regards,
Yann.