XenCenter not deleting install patches

SCOPE
To test XenCenters "Allow XenCenter to delete the update installation file" feature using:

XenServer 6.5 (vanilla)
XenCenter 6.6.90.2887 (64-bit) from Dundee Build 108055c
Install applicable Hotfixes for XenServer 6.5 SP1 to most current Hotfix
Enable "Allow XenCenter to delete the update installation file" feature

USE CASE
To test the patch clean-up feature from the last Dundee Drop (30-OCT-25)
To ensure the option is consistent versus last test, ie "Do not expect it to delete previously installed updates"

TESTING

• Installed XenServer 6.5 (vanilla)
• Installed XenCenter 6.6.90.2887 (64-bit) from Dundee Build 108055c
• Using the update feature, selected SP1
• Following the dialog, selected/enabled "Allow XenCenter to delete the update installation file"
• After install of SP1 and reboot, validated that var/patch/ had indeed cleared the SP1
• Continued installing patches and randomly rebooted after 1-3 patch applications

RESULT
Found that patch files still existed in /var/patch/

rr---- 1 root root 116037947 Nov 2 17:56 1173e85e-1681-1b48-9c3f-2b0bde485857
rr---- 1 root root 3952258 Nov 2 17:52 1ecaa5b4-7d76-db05-923a-f7787ac0268e
rr---- 1 root root 3954033 Nov 2 18:21 1ffaa416-0aa2-7908-1a32-d616d1f72e37
rr---- 1 root root 508248 Nov 2 17:48 3ada8d9d-82c3-d8e2-6cb4-63317058ec9b
rr---- 1 root root 3953565 Nov 2 18:16 529336da-82f4-a648-cc9d-f35673027379
rr---- 1 root root 3952197 Nov 2 18:07 ade5c0d2-b238-756c-0452-5530d404dabe
drwxr-xr-x 2 root root 4096 Nov 2 18:22 applied
rr---- 1 root root 20662763 Nov 2 17:51 b0cc6ebc-b33d-b5e4-7aa3-378deb49a633
rr---- 1 root root 116947333 Nov 2 18:13 b4a72ace-2df3-1d4e-cba2-3ff45a56a24f
rr---- 1 root root 3952568 Nov 2 18:11 e50988d1-93a4-0350-1f81-6cccc63af74b

CONTROLLED TEST
Using XenCenter 6.6.90.2887 (64-bit) from Dundee Build 108055c
Installed XS62ESP1033 by itself with the "Allow XenCenter to delete the update installation file" enabled
Allowed XenCenter to reboot my XenServer after applying patch
I did find that when installing XS62ESP1033, the patch WAS removed

SUSPICION AND OR IDEA

• When installing multiple updates without rebooting, patch files can be left over?