I tried really hard to replicate the issue in a separate application
for almost a full hour and I couldn’t.
It only happens to one file and it doesn't happen if I rename it.
Since this seems to be an odd case instead of a general issue, I
gave up on trying to identify it as I don’t actually need to run my
specs in minified versions of my assets and if I needed to it was
just a matter of renaming the spec affected by this bug.
Also, for the record, it doesn't seem that config.assets.precompile
option is required for this to work as my other assets were being
minified even when not specified in the precompile option.