S6977 definitely impacts RELIABILITY, but it was typed as a
`CODE_SMELL`.
However, if reliability is the main quality of an issue, then it should
be paired with the `BUG` type.
S6977 is not a BUG in the sense that correctness is affected.
At the same time, the previous MAINTAINABILITY quality is not impacted at all.
Also, the issue does negatively affect performance, so it is bug in that sense.
Thus, the decision was made to change the type to `BUG`.
See also
https://sonarsource.slack.com/archives/C026N4DMXNK/p1740474666962219?thread_ts=1740420785.011249&cid=C026N4DMXNK
for an internal discussion.
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