Describe the bug

How to Reproduce
When I add layers from PostGIS DB using QTask then I have problem with vertex tool.
QGIS and OS versions
QGIS version
3.8.0-Zanzibar
Additional context
it may be just me but I fail to understand the issue.
@gioman I think the problem is the geometry displayed by the vertex tool (in red) and the geometry displayed by the layer (in yellow) are not in sync
Sounds like you're adding layers in a background thread. This is a tricky thing, you need to ensure the letters are transferred correctly to the mein thread before adding to the project. It's not an issue though, it's a question for stackexchange or the developer list.