Path expected for join

[elvysmarcos]

After I updated to the latest version 5.3.1, all Joins made with linq where the table is mapped with xml and contains discriminator, simply stop working, this just for Join, because when I do just one ToList only in the table it works normally.

[bahusoid]

One place is still not blurred... I removed all the pictures to keep your secret :)

[hazzik]

Fixed by #2464