Hello Ugo ,
Thank you for the screenshots.
To better scope my research, could you please confirm whether this issue persists when using a different keyboard, as it may be hardware-related? Additionally, does the issue occur in the Microsoft app as well? I have replicated the same configuration as shown in your screenshots and was unable to reproduce the behaviour you described.
If the keyboard is not the cause and the issue can only be reproduced in RDM, I suggest exporting the entry (please ensure that any sensitive data is removed beforehand) and sending it to me privately by clicking on my name so we can review it further.
Best regards,