Multiple left joins fail to work

Using LinqToDB 1.7.6 and a Firebird database. Trying to run a query like:

select *
from shops
left join organizations on ...
left join ocrconfig on ...

C# LINQ code:

var list = (from shop in shops
           join org in orgs on shop.OrganizationId equals org.Id into orgGroup
             join ocr in ocrTable on shop.CustomerNumber equals ocr.CustomerNumber into ocrGroup
            from ocrItem in ocrGroup.DefaultIfEmpty()
            from orgItem in orgGroup.DefaultIfEmpty()
            select new OrgShopPairAdminPn { ShopPn = shop, Organization = orgItem, OcrConfig = ocrItem });

Result: Table not found for ‘LinqToDB.SqlQuery.SelectQuery+Column’

If I only have one left join all is well:

var list = (from shop in shops
            join org in orgs on shop.OrganizationId equals org.Id
            join ocr in ocrTable on shop.CustomerNumber equals ocr.CustomerNumber into ocrGroup
            from ocrItem in ocrGroup.DefaultIfEmpty()
            select new OrgShopPairAdminPn { ShopPn = shop, Organization = org, OcrConfig = ocrItem });

Unfortunately I need left joins here.

[ili]

This looks like the bug & smells like the bug. Should be reproduced & fixed

[MaceWindu]

Looks like we accidentally fixed it at some point. Works in preview2