Can't write CLR type with handler type Int32Handler

[killergege]

When moving from Core 2.2 to Core 3.1 and upgrading the lib Npgsql.EntityFramrworkCore.PostgreSQL from 2.2.0 to 3.1.4, I still have the issue reported and fixed by #489 but only in specific cases.
It seems that if the enum is a variable and is casted in the expression it fails, while if it "hard coded"or casted outside, it works.
It was working in 2.2

This works (hard coded enum):

public IQueryable<Request> GetFilter(IQueryable<Request> query)
{
   query.Where (r=>r.ApplicationId == (int)Applications.App1)
   return query;
}

This doesn't work (enum value in a variable) (throws InvalidCastException "Can't write CLR type Applications with handler typeInt32Handler"):

public IQueryable<Request> GetFilter(IQueryable<Request> query, Applications application)
{
   query.Where (r=>r.ApplicationId == (int)application)
   return query;
}

But this works:

public IQueryable<Request> GetFilter(IQueryable<Request> query, Applications application)
{
    var app = (int)application;
    query.Where (r=>r.ApplicationId == app)
   return query;
}

[roji]

Duplicate of #1281