You can temporarily switch to the "Next theme" as a workaround.
I’ll fix it soon.

This is theme related? I use my own theme. Can you tell me what I need to change to make it working again?

Please temporarily add the following line to your theme:

html {
    --selection-background-color: #3399FF70 !important;
}

You can remove it in the next version.

Thank you, this works. This also lead me to notice, that text selection in the editor is not shown either, which is the same issue.

Switching themes fixed the highlighting issues across the entire interface for me as well. Default themes might need a touchup.

Thanks. Switched to "next" theme, and it worked, I can live with that, but I miss my dear beautiful "Steel Blue" theme. hope it get fixed soon.

Thanks. Switched to "next" theme, and it worked, I can live with that, but I miss my dear beautiful "Steel Blue" theme. hope it get fixed soon.

@Disentimes You can temporarily add the following line to your theme to fix the issue:

html {
    --selection-background-color: #3399FF70 !important;
}

You can remove it in the next version.