Bug XenForo tries to send push notifications to invalid URLs

[Kirby]

I havn't found a definitive reference for this yet, but it seems that Chrome / Chromium sometimes generates placeholder URLs starting with https://permanently-removed.invalid/fcm/send for invalid / expired push subscriptions, see XF 2.3 - Push notification failure: cURL error 6

XenForo currently accepts those URLs and tries to send notifications there which obviously fails and kinda floods the error log if those endpoints are utilized...

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