Scheduled Messages still send after deletion

I am working on a bot to auto reply to posts in a channel, schedule a message to bump the thread in the future, and delete those scheduled replies if someone from a certain group does reply.

I have the messages scheduled, and the delete call working, but the messages are still sending.

Here is the response from scheduledMessages.list when someone from the group responds, before I cancel.

{
  ok: true,
  scheduled_messages: [{
    id: 'MESSAGE_ID',
    channel_id: 'CHANNEL_ID',
    post_at: 1619723987,
    date_created: 1619723857,
    text: 'responding to thread'
  }]
}

I keep track of the ID, and post it to the deleteScheduledMessage call and get this response:

{ok: true}

After the cancellation, getting the list again, it is removed:

{ok: true, scheduled_messages: []}

However, the scheduled message still sends. I have ran into another person who has encountered this issue and I believe it is a bug.

I am using an AWS lambda with a DynamoDB to track the messages, but I don't believe this is an issue on that side.

slackhq / slack-api-docs

Scheduled Messages still send after deletion #107