Node's handle will only allow movement along a predetermined angle

[Boldline]

Occasionally I notice that a node's handle will only allow me to move along a predetermined angle.
I can move the node itself most of the time, but editing the handle is limited. I could see this being a cool feature if implemented correctly. Perhaps it's already a feature and I'm inadvertently activating it and causing my own issues?

The only way I've found to get out of this limitation is to make a new node nearby and delete the original one giving me trouble.

Here is the file below. it's the node at the very top of the shape

0_1694618088043_constrained angle node.vstyler

[VectorStyler]

@Boldline The node type is set to smooth (see in the context panel).

[Boldline]

@VectorStyler ok thank you for showing me that. When I go and switch it from smooth to cusp and then back to smooth again, the handles are no longer locked in on one specific angle, yet the node is now set to "smooth". Is there something more to setting the locked in angle on the handle?

[VectorStyler]

@Boldline Deleting a node between a line and a smooth node could result in this.