Using the options to change POV or starting room from DevMode in WebEditor breaks everything

[KVonGit]

As soon as you tick either box, the editor crashes. After closing the editor, the game will not reload for editing.

My theory is the WebEditor can't handle this in an editor control:

<simpleeditor>objects</simpleeditor>

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NOTES

From Discussion #1430

Important

This user cannot install tje desktop version and has requested the game file be fixed for online use.

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When I click "Select another starting location for the player", this happens immediately:

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And the game will no longer open for editing.

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This game attribute getting set seems to be the issue: <devmode_changepovpos />

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Uncaught TypeError: refreshTreeSelectElement is undefined
    initialiseElementEditor https://quest.textadventures.co.uk/Scripts/GameEdit.js?c=413940291:242
    initialiseTree https://quest.textadventures.co.uk/Edit/Game/386687:144
    jQuery 10
    initialiseTree https://quest.textadventures.co.uk/Edit/Game/386687:142
    jQuery 11
    selectTreeNode https://quest.textadventures.co.uk/Scripts/GameEdit.js?c=413940291:1223
    initialiseTree https://quest.textadventures.co.uk/Edit/Game/386687:152
    jQuery 21
    initialiseTree https://quest.textadventures.co.uk/Edit/Game/386687:121
    <anonymous> https://quest.textadventures.co.uk/Edit/Game/386687:62
    jQuery 4
GameEdit.js:242:9

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DEBUGGING NOTES

This works with no issues in the desktop version of Quest.

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The editor controls:

CoreDevMode.aslx L861-L875

    <control>
      <caption>[EditorGameDevModeChangePovPos]</caption>
      <controltype>checkbox</controltype>
      <attribute>devmode_changepovpos</attribute>
      <mustinherit>devmode</mustinherit>
    </control>


    <control>
      <controltype>expression</controltype>
      <simple>[EditorGameDevModePlace]</simple>
      <simpleeditor>objects</simpleeditor>
      <attribute>devmode_povpos</attribute>
      <onlydisplayif>game.devmode_changepovpos</onlydisplayif>
      <mustinherit>devmode</mustinherit>
    </control>

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Selecting the option to change POV from DevMode has the same issue online.

I'm wondering if the WebEditor app can handle <simpleeditor>objects</simpleeditor>