Ungoogled Chromium indeed reproduces the issue. But so does the public library, which likely was Firefox in Windows. So i guess it might be hasty to conclude that it’s browser specific, particularly when other videos on the same instance behave differently in the same browser.
#digitalExclusion
Shame this is posted on a centralized Cloudflare instance, which causes problems for people using Tor,VPNs,CGNAT,etc: