When using any of the Set Linear Limit nodes (X/Y/Z) and converting a project from a previous version of the engine, the nodes get their Constraint Type value reset to Free. I tested this with project made in 4.25.4 as well as 4.21.2.
When testing a project made in 4.21 and converting it into 4.25.4 @ CL 14469661 this did NOT occur so marking as a Regression
The constraint type pin on the Set Linear XLimit node has been reset to Free
The constraint type would maintain its value when converting to a newer version of the editor
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-109380 in the post.