The syntax is correct. You may have syntax error in your other server events, e.g. Row_Rendered. (There are many other server events generated before UserID_Filtering. You should check the syntax of the whole page.
It is syntax error, the script cannot be run, you cannot “debug” yet, you need to review the code in your server events and check the generated code, e.g. you may use any editor that support php linting.
Conversion may not 100% correct, as the [migration guide](Migrating to v2025) says:
However, the conversion cannot be 100% and you’ll need to do some updates yourself.You should open the problem file in a text editor and check the syntax first, sometimes you may be just missing is “}”. As said, you better use any editor that support php linting.