Inserting HLS bumpers MediaTailor Ad Insertion - Duration attribute and Cue out tags

Some context:

I have Media Tailor playback configuration set up for an HLS stream, with an ad decision server set up. I am in the process of testing the stream using safaris browser and hlsjs.video-dev.org. We got to the point where our HLS stream successfully transitions into the the requested ads, and when finished, the stream goes back to the main content.

The Problem:

Now that i have attempted inserting bumpers in the playback configuration the HLS stream will sometimes get stuck, or it will (when ad markers ar encountered) play an ad for a couple of seconds > switch to bumpers > then to ads > then it will freeze when ad time is over. I refresh the page manually and the main content (next video) will be playing. I tried to follows mediatailors Conditions on how to apply bumpers but i suspect that how i edited the manifest files to add the duration tags might not be correct, so i come here for help.

This is how i have edited one of the bumper manifest-files

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-PLAYLIST-TYPE:VOD

#EXT-X-DISCONTINUITY
#EXT-X-CUE-OUT:DURATION=6
#EXTINF:6,
manifest1080p4100_00001.ts
#EXT-X-CUE-IN
#EXT-X-DISCONTINUITY

The bumper is 5-something seconds so the Target durations is set to 6. Should it be more exact maybe? Or is there anything else wrong with the manifest file of my bumper? I have added the cue-out tag as the insert-bumpers page requires, but i wonder if i should have the cue-in and discontinuity tags ( i assume they should be there ). I just need some clarification on inserting bumpers. I have googled and searched, but can not find any detailed guide on how to insert bumper in media tailor. Please help <3.