Combination of numbered lists and indented bullet list not working

[bloemy7]

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Flutter Quill Version

11.4.1

Steps to Reproduce

1. Using the editor, create a numbered top level list, and then under that an indented bullet list
2. Then try to get a second item of the top level list added that starts with number 2

Expected results

Ability to combine top level numbered list with indented sub lists

Actual results

Unable to get the list to continue at number 2 - it always gets back to number 1

Additional Context

Here is a screenshot of what I always end up with.

I tried modifying the underlying delta in every way possible but am not able to achieve the expected result.

[lanlin]

same issue