Password Prompt for E2E, Though Disabled

I am using Nextcloud 15 and just upgraded my Windows client to Version 2.6.1stable-Win64 (build 20191105) and keep getting this prompt on startup.

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If I cancel the dialog, the client resumes operation as normal.

According to the server, E2E is not enabled for my user.

How can I stop this dialog from popping up? I have looked through the admin panel and cannot find any related settings.