When "Template:Multiple issues" is not used, results can be confusing:
1) Confusion 1
The current implementation assigns the highest priority icon to all the issues in the ambox like so:
{F24904115}
The expected behavior is that each issue would retain its original icon.
= Developer notes
We have already accumulated a lot of technical debt.
1) Decline this task, edit pages we identify that exhibit the problem. Find a way to flag this problem to editors e.g. T200880
2) Only show the first issue, hiding any adjacent issues (easily done via CSS selector). Possibly cause confusion.
3) Retain icons, but don't change behaviour (hopefully a small amount of work that benefits few pages but no promises)
Note: We will not be programmatically collapsing these. That would be significant tech-debt.