Could you please provide more information -- having a site to reproduce that or at least screenshots of the requests would probably help.
Note that the expected behavior for cookies for cross-origin requests now is not to display raw cookies in DevTools (see  issue 793692  for details), but this does not affect whether cookies are actually sent.

Unfortunately I cannot give a site that reproduces as the sites I have seen this behavior on are not on the public internet. I can't confirm with any external sites as the map request doesn't show in devtools and the only proof I have that the map request was made is from server side logs.  

Without any map requests showing in devtools I'm not sure what I would take a screenshot of. Are css map requests showing up in the dev tools networking tab for you?

These were not cross domain requests, so I don't think  issue 793692  is related.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

As per comment# 2 from reporter, it isn't possible to provide sample Test filer/URL that reproduces the issue, without sample file TE cannot proceed further on triaging the issue. Hence requesting someone from the Platform>Devtools team help in providing further inputs on this issue.

Thanks!

We face the same issue not only for css source maps but also for JS source maps. We see this issue on Linux and Windows. 

Chromium version:  71.0.3578.98 (Offizieller Build) Arch Linux (64-Bit)

I attached two screenshots of the source map request which I captured via mitmproxy. One with Chromium 71.0.3578.98 where the cookies are missing and the same request with Chromium 70.0.3538.77 which contains the cookies.

As this is an non public application my company is working on I cannot send you a real example you can test yourself.  

Please let me know if you need more information. 

Deleted: source_map_req_wo_cookie_chromium_71.png 48.4 KB

	source_map_req_wo_cookie_chromium_71.png 48.4 KB View Download

Deleted: source_map_req_with_cookie_chromium_70.png 51.9 KB

	source_map_req_with_cookie_chromium_70.png 51.9 KB View Download

As per comment#2 updating comment #5 and removing Needs-Bisect label.

More details, it happens when `SameSite` is `lax`,and with chrome console opened in 71 .

This issue exists on MacOS as well.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0a9c2ed1e36b2d3cebe2845806a355ea470ec50

commit a0a9c2ed1e36b2d3cebe2845806a355ea470ec50
Author: Andrey Kosyakov <caseq@chromium.org>
Date: Tue Jan 08 03:50:59 2019

DevTools: fix SameSite cookies not sent after migration to SimpleURLLoader

Bug:  915637 , 915739 
Change-Id: I15eecfd7d3e8c992d0907b6499c57764ca538f09
Reviewed-on: https://chromium-review.googlesource.com/c/1399515
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620611}
[modify] https://crrev.com/a0a9c2ed1e36b2d3cebe2845806a355ea470ec50/chrome/browser/devtools/devtools_ui_bindings.cc
[modify] https://crrev.com/a0a9c2ed1e36b2d3cebe2845806a355ea470ec50/content/shell/browser/shell_devtools_bindings.cc
[modify] https://crrev.com/a0a9c2ed1e36b2d3cebe2845806a355ea470ec50/third_party/blink/renderer/devtools/front_end/Tests.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0cacdf46e76e875a484d8dbd6b3525f9fdd6f017

commit 0cacdf46e76e875a484d8dbd6b3525f9fdd6f017
Author: Andrey Kosyakov <caseq@chromium.org>
Date: Thu Jan 10 18:57:54 2019

DevTools: fix SameSite cookies not sent after migration to SimpleURLLoader

Bug:  915637 , 915739 
Change-Id: I15eecfd7d3e8c992d0907b6499c57764ca538f09
Reviewed-on: https://chromium-review.googlesource.com/c/1399515
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#620611}(cherry picked from commit a0a9c2ed1e36b2d3cebe2845806a355ea470ec50)
Reviewed-on: https://chromium-review.googlesource.com/c/1405538
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/branch-heads/3626@{#633}
Cr-Branched-From: d897fb137fbaaa9355c0c93124cc048824eb1e65-refs/heads/master@{#612437}
[modify] https://crrev.com/0cacdf46e76e875a484d8dbd6b3525f9fdd6f017/chrome/browser/devtools/devtools_ui_bindings.cc
[modify] https://crrev.com/0cacdf46e76e875a484d8dbd6b3525f9fdd6f017/content/shell/browser/shell_devtools_bindings.cc
[modify] https://crrev.com/0cacdf46e76e875a484d8dbd6b3525f9fdd6f017/third_party/blink/renderer/devtools/front_end/Tests.js

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/0cacdf46e76e875a484d8dbd6b3525f9fdd6f017

Commit: 0cacdf46e76e875a484d8dbd6b3525f9fdd6f017
Author: caseq@chromium.org
Commiter: caseq@chromium.org
Date: 2019-01-10 18:57:54 +0000 UTC

DevTools: fix SameSite cookies not sent after migration to SimpleURLLoader

Bug:  915637 , 915739 
Change-Id: I15eecfd7d3e8c992d0907b6499c57764ca538f09
Reviewed-on: https://chromium-review.googlesource.com/c/1399515
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#620611}(cherry picked from commit a0a9c2ed1e36b2d3cebe2845806a355ea470ec50)
Reviewed-on: https://chromium-review.googlesource.com/c/1405538
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/branch-heads/3626@{#633}
Cr-Branched-From: d897fb137fbaaa9355c0c93124cc048824eb1e65-refs/heads/master@{#612437}