You're not alone. This problem only occured when I upgraded to Big Sur.
What I noticed is that I can now connect to 5ghz networks easily. I'm now having a hard time connecting via 2.4Ghz, using the same SSID.
Once again, this only happened after upgrading to Big Sur, from Catalina.
jehzlau
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Oh I'm glad I'm not alone. I left it downloading since yesterday and it's still downloading. Haha!