Behavior change after bumping up to 1.6.0 from 1.4.9

[jayasuryat]

I have updated the library version from 1.4.9 to 1.6.0, along with updates to Kotlin and KSP versions:
Kotlin version: 1.7.0 -> 1.9.24
KSP version: 1.7.0-1.0.6 -> 1.9.24-1.0.20

Issue

After these updates, I have observed a change in the compilation results. In some instances where the result was previously KotlinCompilation.ExitCode.OK, it is now returning KotlinCompilation.ExitCode.COMPILATION_ERROR.

This new result is logical since it returns KotlinCompilation.ExitCode.COMPILATION_ERROR in scenarios where an error log is produced in the Symbol processor implementation. (Otherwise the code compiles successfully)

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Question

Do you have insights into whether this behavior change was introduced by the newer library version, KSP, or the Kotlin Compiler itself?

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Reproduction

I have created a minimal project that reproduces the behavior. The test that passed before the version updates is now failing after updating the versions: jayasuryat/KspBehaviorChangeIssue#1

[tschuchortdev]

If I had to guess, it is probably related to internal changes in the compiler and/or KSP. At least I couldn't find any commit since 1.4.9 that would influence the error handling. There have been issues with errors originating in KSP processors before, so perhaps the new behaviour actually fixes #325?