Minor issue: TeamCity shield doesn't show on Github

[JoerivanEngelen]

The TeamCity build shield in the Readme doesn't show anymore.

When I follow the link to the svg manually, it DOES show:

So I guess some port has been closed on TeamCity which prevents Github from reaching this shield?

[Manangka]

The link it is referring to still works:
https://dpcbuild.deltares.nl/app/rest/builds/buildType:id:iMOD6_IMODPython_Windows_Tests/statusIcon.svg

Could there be something wrong with the GitHub cache?