I turned on elevation correction, which on other platforms (Garmin, TP, etc.) make the altitude data more accurate, but on Intervals its very wrong.
Since it impacts GAP and load calculations, it makes this feature completely useless.
I have seen it on many runs, here is one example - this is all on road in central park, so should not be any map elevation issues:
Intervals with elevation correction on:
Intervals with watch elevation:
Garmin Connect with elevation correction on:
Garmin Connect watch: