CSS resources refresh problem when "static" is mounted on "assets" (with example repo)

[divinerites]

What version of Hugo are you using (hugo version)?

$ hugo version 
Hugo Static Site Generator v0.75.1/extended darwin/amd64 BuildDate: unknown

Does this issue reproduce with the latest release?

yes.

• When we mount /static/css/ in assets/css and use them as resources the refresh is not correctly done.
• You can see a minimal example here
• Steps to reproduce :

1. go to index.htm => h2 is red in static/css/static.css & h3 is blue in assets/css/assets.css
2. change background in assets.css for yellow => works as expected. Refresh OK. background is yellow.
3. change background in static.css for green => there is no refresh. Background stays red. The site is rebuilt, but not refreshed (see message below)
4. Change anything is assets.css and save => the refresh is OK and the static background is now showing green.
5. --disableFastRender has no effect.

[[module.mounts]]
    source = "static/css"
    target = "assets/css"
[[module.mounts]]
    source = "assets/css"
    target = "assets/css"

Change of Static files detected, rebuilding site.
2020-09-27 15:56:49.063 +0200
Syncing css/static.css to /

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. The resources of the Hugo team are limited, and so we are asking for your help.
If this is a bug and you can still reproduce this error on the master branch, please reply with all of the information you have about it in order to keep the issue open.
If this is a feature request, and you feel that it is still relevant and valuable, please tell us why.
This issue will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.

[jmooring]

This came up again, but when assets is mounted to static:
https://discourse.gohugo.io/t/is-this-worth-mentioning-in-the-docs/37345

To reproduce:

git clone --single-branch -b hugo-forum-topic-37345 https://github.com/jmooring/hugo-testing hugo-forum-topic-37345
cd hugo-forum-topic-37345
hugo server

Then in a new terminal:

echo "body {color: red}" > assets/styles.css 

The page is not refreshed.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. The resources of the Hugo team are limited, and so we are asking for your help.
If this is a bug and you can still reproduce this error on the master branch, please reply with all of the information you have about it in order to keep the issue open.
If this is a feature request, and you feel that it is still relevant and valuable, please tell us why.
This issue will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.

[divinerites]

Still present in v0.110.0