As Bump PHP parser indicates a major update has been done to the main library in charge of parsing php code into AST nodes.

There are some differences between the old and new php parser, the differences are mostly new nodes, as you can check in it's CHANGELOG. This new nodes have increased the resulting AST depth, which has forced us to modify both the DEFAULT_MASS_THRESHOLD and POINTS_PER_OVERAGE in order to avoid overwhelming existent users with new issues.

The approach that we have taken for manipulating this constants has been: "Avoid generating new issues for customers". Also, we did research about which was the approach used in the project for this kind of changes and seems like they were very empirical based. Being said that, I propose to try this settings and came back if we have any customer's reports about this.