Description of problem:
Client is doing a FFU.
At the command  "upgrade run" it fails with the following:
2024-03-13 19:00:38.495328 | ~~~~~~~~~~~~~~~~~~ Number of nodes which did not deploy successfully: 11 ~~~~~~~~~~~~~~~~~
^[[0;31m2024-03-13 19:00:38.495959 |  The following node(s) had failures: computedpdksl-12, computedpdksl-13, computedpdksl-14, computedpdksl-15, computedpdksl-16, computedpdksl-17, computesl-13, computesl-14, computesl-15, computesl-9, undercloud^[[0m
2024-03-13 19:00:38.496609 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

But those nodes were previously deleted:
2021-10-01 10:50:17.096502 overcloud-node-delete nodes=['computesl-0', 'computesl-1', 'computesl-2', 'computesl-3', 'computesl-4', 'computesl-5', 'computesl-6', 'computesl-7', 'computesl-8', 'computesl-9'],

The inventory file /home/stack/overcloud-deploy/overcloud/tripleo-ansible-inventory.yaml is good
but the one in /home/stack/overcloud-deploy/overcloud/config-download/overcloud is wrong.
It gets recreated when the run command is ran.

I ask them for the index of the role computesl and got the following:
(heat) [stack@undercloud ~]$ openstack stack resource show 8659c656-e258-4f27-ade6-b7eae7ae28b7 9 --fit
~~~
| attributes             | {'hostname_map': {'storage': 'computesl-9 ...
| creation_time          | 2024-03-13T20:30:48Z  
~~~

Can I trust this value of creation time ?
Because just before that time I see the prepare command was run:
2024-03-13 20:28:54.245842 overcloud-upgrade-prepare

In my lab it looks valid.

Now the question becomes why/how those old index appear suddenly.

We need your help to identify what is causing this here.

Thank you!

Version-Release number of selected component (if applicable):
OSP17.1.2

How reproducible:
100% here.

Steps to Reproduce:
1. Create OSP16.2 env
2. Delete nodes
3. Try FFU
4. Fail at run step.

Actual results:
FFU is failing because old nodes appear in the inventory file.

Expected results:
We should not have old nodes in there.

Additional info: