Using assign function from client reverts VM email options to no notification

[dgriesbach.clearcom]

For some time we have been able to open the web or desktop client and assign a different mobile number to an extension without issue. Now anytime the mobile number is assigned through the web/desktop app the VM email options switches back to "No Email Notification" This bug seem to have started once we installed 3CX Version 18, Update 7 Final, Build 18.0.7.312 March 2023. This has resulted in emails getting stuck in this unmonitored VM several times now as its is supposed to always email and delete from the mailbox. Currently there seems to be no way to fix this other than correcting it myself every Monday after our operations department sets the new number. Can someone investigate this issue and advise a fix / workaround.