Expressions involving simple recursion such as layer(index - 1) can severely crash After Effects due to a lack of caching.

Anything involving previous layers, for example:
thisComp.layer(index - 1).effect("Slider Control")("Slider") + 1

When duplicated enough causes AE to crash.

With the ExtendScript engine, it usually causes a warning message.
With the JavaScript engine, it often crashes After Effects completely.

Here are some example projects for testing:
https://drive.google.com/drive/folders/1Ki02QtXXz-hKjmmvbBU9tgFUi6d_JCFi?usp=sharing

Crash_Example and Crash_Example_2 would likely run if previous expressions were cached, rather than re-evaluated every time.