SQL 2016 SP2 CU12 Change Tracking error

Hello!

I have a table dbo.UserGroup under CT.

Table has primary key with two columns UserInfoID, GroupInfoID, both numeric(35).

There were several operations over that table.

Starting version (change_tracking_current_version) was 2622. Final version was 2713.

We are interesting in operation over the record with UserInfoID = 283887247 and GroupInfoID = 48.

We can see all operations with query (over DAC connection):

select
	T.*
	,CT.*
from
	sys.change_tracking_144719568 as CT
	left join sys.dm_tran_commit_table as T on
		T.xdes_id = CT.sys_change_xdes_id
where
	CT.k_UserInfoID_00000001 = 283887247
	and CT.k_GroupInfoID_00000002 = 48
	and T.commit_ts >= 2622
order by
	CT.sys_change_xdes_id
	,CT.sys_change_xdes_id_seq

There are two operations:

Two operations

delete and insert operations with same primary key.

If we read all operations at once with query

select * from changetable(changes dbo.UserGroup, 2622) as T where T.SYS_CHANGE_VERSION <= 2713 and T.UserInfoID = 283887247 and T.GroupInfoID = 48

we will see one update operation (CT merged changes):

But our service read data in a middle of a process. So it made two queries with version ranges from 2622 to 2684 and from 2684 to 2713.

select * from changetable(changes dbo.UserGroup, 2622) as T where T.SYS_CHANGE_VERSION <= 2684 and T.UserInfoID = 283887247 and T.GroupInfoID = 48
select * from changetable(changes dbo.UserGroup, 2684) as T where T.SYS_CHANGE_VERSION <= 2713 and T.UserInfoID = 283887247 and T.GroupInfoID = 48

And we've got: