Azure CI sample configuration Caching post-job is flaky and gives error on tests success

[LolliDepp]

I have been using the same setup as the sample for Azure CI provided here.
When I finally managed to get all my tests to pass in CI, the "Post-job: Cache Cypress bins" step has started to fail.

When I have no errors in tests, the Cache task fails, and these are the logs:

2020-01-10T17:06:50.0113914Z ##[section]Starting: Cache Cypress bins
2020-01-10T17:06:50.0193903Z ==============================================================================
2020-01-10T17:06:50.0193948Z Task         : Cache (Beta)
2020-01-10T17:06:50.0193975Z Description  : Cache files between runs
2020-01-10T17:06:50.0193996Z Version      : 1.2.0
2020-01-10T17:06:50.0194017Z Author       : Microsoft Corporation
2020-01-10T17:06:50.0194042Z Help         : https://aka.ms/pipeline-caching-docs
2020-01-10T17:06:50.0194142Z ==============================================================================
2020-01-10T17:06:50.2238310Z Resolving key:
2020-01-10T17:06:50.2349172Z  - cypress           [string]
2020-01-10T17:06:50.2349974Z  - Windows_NT        [string]
2020-01-10T17:06:50.2666611Z  - package-lock.json [file] --> 63A80EC9E3A4E0A34E40189651B6B5B6EB7B784D1FEB36DD90E42B6CC7170141
2020-01-10T17:06:50.2691627Z Resolved to: cypress|Windows_NT|hrtsPiTYC1pcs0pjVg63hUkQVRMtMwr3usRTXv5b13w=
2020-01-10T17:06:51.0380288Z Information, ApplicationInsightsTelemetrySender will correlate events with X-TFS-Session ccc5c3d1-1bb9-4861-90e5-fabad7a03c2a
2020-01-10T17:06:51.0556914Z Information, Getting a pipeline cache artifact with one of the following fingerprints:
2020-01-10T17:06:51.0557793Z Information, Fingerprint: `cypress|Windows_NT|hrtsPiTYC1pcs0pjVg63hUkQVRMtMwr3usRTXv5b13w=`
2020-01-10T17:06:52.0752523Z Information, There is a cache miss.
2020-01-10T17:06:52.1123659Z tar: could not chdir to 'D:\home\vsts\.cache\Cypress'
2020-01-10T17:06:52.1123706Z 
2020-01-10T17:06:53.0655135Z Information, ApplicationInsightsTelemetrySender correlated 1 events with X-TFS-Session ccc5c3d1-1bb9-4861-90e5-fabad7a03c2a
2020-01-10T17:06:53.0700349Z ##[error]Process returned non-zero exit code: 1
2020-01-10T17:06:53.0852310Z ##[section]Finishing: Cache Cypress bins

When at least one of my tests fail, the Cache task succeeds.

The only visibly difference seems to be I can see "test failure" logs being written to ...\AppData\Roaming\npm-cache\_logs\2020-01-10T14_29_25_544Z-debug.log in case I do have a failure.

I've tried with Cache v2, and with Cache v1 Beta (same as the example), but no differences.
Error logs are identical with the 2 versions.
With both, it only fails if tests suceed

[Coding-Means-Always-Learning]

Hello @LolliDepp ,
I am having the same problem.

This does not seem to be occurring in a Linux agent
As we are required to use Windows agent I am seeing the exact issues you are referring

Did you had any luck in resolving this