Enabling snapping on features created with PyQGIS

I have implemented a custom digitizing tool derivated from QgsMapToolDigitizeFeature class.

Here is the code written to save the feature into the layer:

layer.dataProvider().addFeatures([feature])
layer.commitChanges()

layer.triggerRepaint()
self.canvas().refresh()

1. I use the standard QGIS tool to create a new feature A. The feature A is properly added to the layer.
2. I use my custom tool to create a new feature B. The feature B is properly added to the layer.
3. Then, I use the QGIS standard tool again. Snapping works on A vertices but not on B.
4. If I save the project, close it and open it again, snapping works as expected on all the features.

How to make the snapping work on newly created features?

Any ideas?

layer.dataProvider().addFeatures([feature])

layer.addFeature(feature)