Environment (Required on creation):

7.16-alpha4-ee

cockroachdb (jdbc 42.2.9)

spring-boot 2.5.3

macOS

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

When performing step 6.iv from the standard regression test the engine throws an exception. However, the migration seems to work (three out of four times). 

Steps to reproduce (Required on creation):

perform step 6.iv from the standard regression test (steps before can be skipped).

I clicked on observe batch operation, before the exception appear, but I am not sure it is related. 

Observed Behavior (Required on creation):

Exception is thrown in the log (see attached file)

Expected behavior (Required on creation):

There should not be an exception.

(Optional):