Hi Justin,
I have seen similar issue. Based on the join condition used here I am guessing these are CRM BUT... tables.
The problem is, even though they both are declared as varbinary the problem lies in the original tables. One of the tables actually stores values of varbinary value in the column or the other is the varbinary.
shortterm solution: created a generated column and used it for join.
I have raised this with SAP still awaiting answers. Hopefully we will get some resolution now.
Regards
PK