Problems inserting the title card; it is not applied after selection.

I'm having trouble inserting the title card; it's not being applied after selection. This problem started after the Home Assistant update to Core 2026.03.0, and it persists even after updating to 2026.03.1. Everything worked fine until Core 2026.02.3. I updated the Expander card to version 6.0.4, but that didn't change anything.