Rspamd MX Check Expiration not applying

[Wuensch-AG-Adm]

Hello there,
when we set a Expiration in the MX Check Option of Rspamd in our OPNSense, and click Apply and afterwards switch to another Register the parameter is not applied and the field is empty.
Could this be a communication problem between Rspamd and Redis?
We would hope to find a solution so we can set this parameter.
Thanks in advance
T. Beyer