Recently this was fixed in Vega intentionally, however this auto-filling used to save our staff time in their weekly tasks. Ideally when you select a showcase, the title would be auto populated into the 'Showcase block title' box. Instead, it remains unchanged from the previous showcase. In the page preview, the showcase itself successfully changes (the books reflect the new selection), but the title doesn't update. This means our staff must type in the title each time.