Your system information

Steam client version (build number or date): March 4, 2022, at 17:59:32
Distribution (e.g. Ubuntu): Gentoo
Opted into Steam client beta?: [Yes/No] Happens with beta and stable
Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist

The browser part of the steam window is completely black. The menu and bottom part of the steam window are shown normally.
Console prints alot of the following:
src/steamexe/main.cpp (253) : Assertion Failed: reaping pid: 18004 -- steam
src/steamexe/main.cpp (253) : Assertion Failed: reaping pid: 18004 -- steam
src/common/html/chrome_ipc_client.cpp (410) : m_hCEFHandle == INVALID_PROCESS_HANDLE
src/common/html/chrome_ipc_client.cpp (410) : m_hCEFHandle == INVALID_PROCESS_HANDLE
steamwebhelper.sh[20363]: Runtime for steamwebhelper: defaulting to /mnt/daten/Home/.local/share/Steam/ubuntu12_64/steam-runtime-heavy
Steam worked before the March 4 update and after it this happens.

Steps for reproducing this issue:

start steam