I had also the same issue, I was using the Azure function and shared library for SQL operation but the Nuget package for both projects was different so causing this issue.
this may happen due to differences in Nuget packages.
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InvalidOperationException: Sequence contains more than one matching element , While update the .net core version 3.1 to 6.0 using abp Framework, the FirstOrDeafult, toList any extension not working
I had also the same issue, I was using the Azure function and shared library for SQL operation but the Nuget package for both projects was different so causing this issue.
this may happen due to differences in Nuget packages.