I'm working for a company that was originally a 40h workplace, but since last month and until the end of January will test a 32h week, with preferably the Fridays off (preferably because there are some departments that must have at least one person every day). After this test period the management will evaluate the productivity, basically some OKRs set before the change and if objectives were met we will keep this benefit.

Important to mention that no other benefit was removed or any salary reduced.