Change fields does not work in MCA Selector 2.4

[mysteryAftermath]

Describe the bug
Change fields does not work in MCA Selector 2.4

To Reproduce
Steps to reproduce the behavior:

1. Open a world
2. Select a chunk
3. Go to 'Tools' -> 'Change Fields'
4. The change fields window does not open, and an error is logged

Expected behavior
The change fields window opens

Environment (please complete the following information):

• OS: Pop_OS 22.04
• Java version: zulu21.32.17-ca-fx-jre21.0.2-linux_x64
• Version of MCA Selector: 2.4

Additional context

• This does not occur in mca selector 2.3
• I believe this was caused by commit 58cef47

[Querz]

fixed in 2.4.1.