uploading a custom logo does not change the logo on the login page

[individual-it]

Describe the bug

even after uploading a custom logo, the original ownCloud logo is shown on the login page

Steps to reproduce

1. as admin upload a custom logo in the admin settings
2. logout

Expected behavior

the new logo should be shown on the login page

Actual behavior

the original logo is shown (signin/v1/static/logo.svg)

Setup

docker compose

docker-compose.yml.txt web.config.json

Additional context

theme.json:

{"clients":{"web":{"defaults":{"logo":{"login":"themes/_branding/Logo-white.png","topbar":"themes/_branding/Logo-white.png"}}}},"common":{"logo":"themes/_branding/Logo-white.png"}}

[main1byte]

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