Editing repeat events bug

(Web - Chrome 107.0.5304.108)

When I try to edit a recurring event and click the 'Save' button, the dropdown menu flashes up very briefly before disappearing. I cannot manipulate it to stay open and so cannot save any changes.

Screen recording here: https://www.veed.io/view/79d16cb9-6e64-48f8-8140-63064f8137ee?panel=share