How to markdown nested list items in Bitbucket?

Use 4 spaces.
# Unordered list

* Item 1
* Item 2
* Item 3
* Item 3a
* Item 3b
* Item 3c

# Ordered list

1. Step 1
2. Step 2
3. Step 3
1. Step 3.1
2. Step 3.2
3. Step 3.3

# List in list

1. Step 1
2. Step 2
3. Step 3
* Item 3a
* Item 3b
* Item 3c

Here’s a screenshot from that updated repo:

Thanks @Waylan, your comment was exactly right.

4 spaces do the trick even inside definition list:
Endpoint
: `/listAgencies`

Method
: `GET`

Arguments
: * `level` – bla-bla.
* `withDisabled` – should we include disabled `AGENT`s.
* `userId` – bla-bla.

I am documenting API using BitBucket Wiki and Markdown proprietary extension for definition list is most pleasing (MD’s table syntax is awful, imaging multiline and embedding requirements…).