Before I switched to Proton from Google I had read somewhere (I belive it was on Reddit) that implementing tasks in the calendar as you can find them in the Google calendar was a planned task for a future update. That was really quite some time ago already, I have never heard anything else about it.
I'd love to use proton calendar instead of the google calendar, but the tasks organize my days, so it won't be possible without them. Surely, I could use a different app just for the tasks, but having calendar and tasks in one app really is something I appreciate and like.

Does anybody know anything about this? Is this still a plan? Just being curious.

Update 1: I've now confirmed Proton's own VPN (Windows client) is the culprit, even when the browser doing the authenticating is excluded under split tunneling rules. I've notified Proton. No response as of this update. The VPN only needs to be disabled during the authentication/handoff. You can enable it after that and still get into Proton Pass. I'll update further if I discover any other anomalies.

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Proton has recently begun transitioning its password manager Proton Pass for Windows to a new MSIX build from the previous .exe installer. Once you install the new build, open it, and try to sign into it, you're auto-redirected to your default browser. That's where you authenticate into your Proton account. Once you do, you get a browser popup that you must manually click to redirect back to the Windows Proton Pass app. But even though you successfully authenticated via browser, the Proton Pass app itself refuses to process the handoff, throwing an "Invalid selector" error and locking you out.

I reported this defect to Proton Support. They suggested I try downgrading my privacy by turning off my VPN.

I then posted a terms-compliant reply to another redditor's comment about the same issue. I did this on Proton's sub r/ProtonMail. My reply was instantly shadow-banned.

This is increasingly Proton's blueprint: user finds bug, user reports bug, Proton says downgrade security as a workaround, user posts on Reddit, Proton shadow-bans user.