Updating a column value via OData return error (500)

Hello

I am updating the unsubscribe column data on Contact records with a php script.

Since a few days i get an error 500 when updating value in Contact: {"DoNotUseEmail":"true"}

When trying the request in postman, I get error 500 the first time, if I immediatly trying a second time it just works.

Using the same php script on a test environment doesnt give me this error.