"Show as" defaults to "opening" for a binary sensor

[mflage]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Binary sensors "must have" a default set to "show as". Unsetting it just reverts it to "Opening".

Describe the behavior you expected

I expect the sensor to go back to a simple on/off state.

Steps to reproduce the issue

1. Add a new binary sensor
2. Change "show as" to some value
3. Unset "show as" by clicking the x next to it.
   ...

What version of Home Assistant Core has the issue?

2025.1.2

What was the last working version of Home Assistant Core?

2025.1.2

In which browser are you experiencing the issue?

Google Chrome 131.0.6778.264

Which operating system are you using to run this browser?

Ubuntu 24.04

State of relevant entities

No response

Problem-relevant frontend configuration

No response

Javascript errors shown in your browser console/inspector

No response

Additional information

No response

[karwosts]

I believe this is by design. It does not revert to Opening, it reverts to the device class initially set by the integration.