Calendar does not create event when Accepting Invitation from subscribed calendar (on linux)

Hi there, I'm having an issue where I receive invitations by the owner of a calendar i subscribed to. I have to subscribe to the calendar to be able to schedule events with them. When I receive the invite, it keeps saying "already processed" which is not the case. I dont have that event in my calendar and it has not been accepted. I have checked that the subscribed calendar is not linked to my account (calendar settings, email account: empty) and the actual calendar is linked to my email account (calendar settings, my email account). what should happen logically is the "subscribed" calendar should not be counted as my calendar, events should not be counted as already processed and invites should be clickable and then be transfered to the calendar linked to the receiving email address. Mind you, thunderbird on mobile works like it should. Its only the linux client that has this issue. Thanks in advance for any help.