I have the same issue, plugins catalog page does not show anything other then the loading icon. I even recently got a fixed ip from my ISP to help me better connect to my media library from the internet, but in this case in does not seam to help.    UPDATE:  Changing DNS fixed it for me. I just used Warp's DNS feature to change it to 1.1.1.1 and it worked. Once installed I went back to the old DNS and it still works.
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