deobfuscate | ast，反混淆 | Parser library

I have seen this code added to the server file. It looks like it is a malicious code, I can't seem a way to deobfuscate/decrypt this code.

I have a Fabric 1.17.1 (Java 16) mod for Minecraft that I am trying to obfuscate. Included with this mod is my event system that handles all the events for my mod. This event system uses the invoke method to call events in my event listener class at runtime.

Here is the the event I am calling using the call method:

I'm hunting for a potential logic bomb in some C# code, which is obfuscated.

Using JetBrains DotPeek, Visual Studio and some search&replace I was able to mostly reconstruct an executable program that can undergo some dynamic analysis.

Problem: the only part that does not compile is the following statement, or whatever it is

I have following string:

I have an Android app and it has been recently crashing building some Fragments. This doesn't happen always, just occasionally.

This is the typical crash log:

I'm trying to figure out how to keep original line numbers with R8.

Doing an app with current AndroidStudio and obfuscating it with R8, and even uploading mapping.txt file to Google Play Console, the Stack Traces of the users are useless in some cases, because the lines of the crash are not the same as in the real non obfuscated file.

This is a sample, my class doesn't have 3000 lines, but the error is reported in line 3052 ( com.mypackage.activities.ManagerActivity.onCreate (ManagerActivity.java:3052) ):

I found a memory leak (using LeakCanary), but code in leak trace is obfuscated. I don't have much experience with code obfuscation and I want to know if there is a way to to deobfuscate it, or maybe disable code obfuscation for that third library code?

The third library code I am using is yandex-ads-sdk. Leak trace:

The title may be misleading, however, I don't know how to phrase it exactly.

What I'm trying to achieve is a response of the correct login details from the provided list and to stop when one set of credentials is correct (see the commented out portion of code).

My issue is that I have no idea what the variable is that determines a successful login, so my question is: how do I find that variable?

In this example from CyberStart Game, when the correct credentials are inputted it will relay a flag (a string of characters) in the green area at the top. Running this code, the green box appears but no flag is presented. My theory is that the code is continuing to run after the correct credentials are inputted and it messes up the display of the flag. NOTE: There is only one set of successful login credentials.

Our program displays a tree control showing the metadata structure of the XML file they are using as a datasource. So it displays all elements & attributes in use in the XML file, like this: