List of available calls disappears, apart from the last one used and then a message appears

### Expected Behavior

I should be able to scroll up and down the list of available calls.

### Actual Behavior

The list of available calls disappears, apart from one of the last ones used and, after a short delay, a message appears

```Application error

Failed to render . Please report the error to [our Github Issues]
```

with the following stack trace

```
TypeError: Cannot read properties of null (reading 'index')
at file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:119:177794
at Ch (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:24296)
at D6 (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:42448)
at z_ (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:36651)
at Ls (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:42:3288)
at ehe (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:41325)
at sc (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:40309)
at rF (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:44:35758)
at N (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:29:1615)
at Immediate.me [as _onImmediate] (file:///Applications/Insomnia.app/Contents/Resources/app.asar/index-016b0889.js:29:1987)
at process.processImmediate (node:internal/timers:476:21)
```

### Reproduction Steps

Scrolling the list of available calls seems to trigger the problem.
It is becoming increasingly less difficult to reproduce, I have had it crash three times in the last two days.

I am using the latest version, and it has only started to happen with this version:

```Version: Insomnia 8.4.5
Build date: 11/23/2023
OS: Darwin arm64 23.1.0
Electron: 27.0.3
Node: 18.17.1
Node ABI: 118
V8: 11.8.172.16-electron.0
Architecture: arm64
```

### Is there an existing issue for this?

- [X] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Additional Information

_No response_

### Insomnia Version

8.4.5

### What operating system are you using?

macOS

### Operating System Version

Sonoma 14.1.1

### Installation method

This was from the last automatic update. Originally installed from insomnia.rest

### Last Known Working Insomnia version

8.4.4?

Start by reproducing the issue in Insomnia 8.4.5 on macOS Sonoma, scrolling the list of available calls until the list disappears and the application error appears. Use the reported TypeError and the call-list behavior to locate the relevant UI entry point and add a regression test or reproduction coverage. Done means the calls remain scrollable without the null-index error.

Written by the indexing model from the issue text.