Unknown block type / missing messages from slack bots

[cabbey]

The slack exports I'm working with (origin: standard format output of a single thread or channel via slackdump) contains a number of messages from bots which use markdown sections. These sections are missing from the rendered page, and the following is logged to the console for everyone:

WARNING:root:Unknown block type: {'type': 'section', 'text': {'type': 'mrkdwn', 'text': "REDACTED MARKDOWN MESSAGE HERE", 'emoji': None}, 'block_id': 'ALSO_REDACTED'}