Lerna 7 + Yarn 3: cache is not invalidated after making changes to source files

[jtpio]

Current Behavior

With Lerna 7 when using the cacheableOperations option to cache build scripts, making changes to source files and re-running the build script does not trigger a new build.

Instead it reads from the cache even though the source files have changed, which is not the expected behavior.

Expected Behavior

When making a change to the source file of a project, re-running a build should not read from the cache.

Steps to Reproduce

Here is an example opened on the repro repository: lerna/repro#13

Here are two screencasts to highlight the issue. It is worth noting this is not an issue with Lerna 6.

Lerna 7

lerna-7-cache-issue.mp4

Lerna 6

lerna-6-cache-no-issue.mp4

Failure Logs / Configuration

lerna.json

{
  "$schema": "node_modules/lerna/schemas/lerna-schema.json",
  "version": "0.0.0"
}

lerna-debug.log

<!-- If you have a `lerna-debug.log` available, please paste it here -->
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Environment

[joshuambg]

Um. Is anybody at Lerna going to look into this? Its a serious error report.

So Lerna caching is just completely broken. The docs are wrong.