My computer at left just leaped from Mojave 10.14.6 build 18G8022 (Clover 5119) to Big Sur 11.2.3 build 20D91 (OpenCore 0.6.7) with no problems. But OpenCore is certainly "quirky!"
After several issues I managed to update OC to 0.6.7 version and then to install Big Sur 11.2.3 from Apple Store to my Dell Latitude E6540 with i7-4910MQ.
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