Popular german Website (owned by ) stuck on login with Brave

Please debug the Login of www.-kleinanzeigen.de This problem exists since I started using Brave, does´t matter which OS! I do not experience this problem on Chrome or Safari. I found an closed thread form march, reporting same problem: Bug reporting: Kleinanzeigen login freezes

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Getting STOD (stuck triangle of doom) trying to log in to `account.brave.com` using `Private window` · Issue #27481 · brave/brave-browser · GitHub

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Credentials purchase doesn't complete, leading to so-called stuck triangle · Issue #26746 · brave/brave-browser · GitHub