I am on the beta channel and I have the same issues. At least it's a known issue (see https://blogs.windows.com/windows-insider/2025/06/13/announcing-windows-11-insider-preview-build-26120-4441-beta-channel/).
As for switching channels, sometimes, the same build is flighted to both the beta and dev channels like it happened a few months earlier (see https://blogs.windows.com/windows-insider/2025/01/31/announcing-windows-11-insider-preview-build-26120-3073-dev-and-beta-channels/) and that is the time when you can switch channels without needing to reinstall.