RSS Feed/News Nested lists do not round-trip as expected when toggling bb-code mode on/off

[ENXF NET]

Toggling the following bb-code causes the DD line to evaporate and a bunch of new lines to be unexpectedly added.
Code:

[LIST]
    [*][B]AA
    [LIST]
        [*][B]BB[/B]
        [*][B]CC[/B]
    [/LIST][/B]
    [*][B]DD
    [LIST]
        [*][B]EE[/B]
        [*][B]FF[/B]
    [/LIST][/B]
[/LIST]

This is the mangled bb-code output
Code:

[LIST]
[*][B]AA

[LIST]
[*][B]BB[/B]

[*][B]CC[/B]

[/LIST][/B]

[LIST]
[*][B]EE[/B]

[*][B]FF[/B]

[/LIST]
[/LIST]

This impacts the final...

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