Sorry, it's really hard to understand your problem. I'm quite sure this is not a bug, thousands are using 5.8 without problems. I guess it's a problem in your workflow.
Here is some things to do:
- Make sure to have LRTimelapse set to Masks 2.0 in the settings.
- Restart
- Remove the sequence from Lightroom
- Load it into LRTimelapse
- Do Metadata / Initialize
- Go though the first workflow row (click on every button).
- Drag the sequence to Lightroom, make sure to have "ADD" selected at the top in the import dialog
- Set the filter to "Keyframes Only"
- Edit the keyframes, just do a simple edit. Never add or remove masks! If you want to use them, you need to use the predefined ones. For now just leave them alone.
- Use the Sync Script to bring the settings of the first keyframe to the next.
- Continue trough all keyframes, sync and then just do the changes.
- Go to Grid View (G) - select all Keyframes.
- Do Metadata/Save Metadata to Files
- Go Back to LRTimelapse
- Click on auto Transition
- Create the Visual Previews
Are your edits applied when you play back the sequence?
- Go back to Lightroom.
- Set Filter to "Full Sequence"
- Select the Whole sequence, do "Metadata / Read Metadata from Files".
- Go to Export, choose "LRTimelapse JPG 4K" on the left as preset then export and render your video.
This is the same as explained in the Workflow descriptions, please follow it step by step.
If you encounter any problems, please describe exactly at which step.
Best use
https://www.deepl.com/ to translate from your mother language.