Just reporting a small bug. Data Explorer's icon has not (yet) been updated:
Its icon is no longer
but is now
Given the Planned Maintenance scheduled for Wednesday, February 5, 2020 for Data Explorer, I took the opportunity to raise this problem on meta.SE. This was the reply:
I am aware of the request to fix that issue but it’s not as easy as it first appears. That fix is out of scope for this maintenance window. I’ll circle back to it after we’re done and see if we can resolve it. – Taryn♦
This seems to be a long-standing issue affecting several other sites as well.
A developer answered another related question here: https://meta.stackexchange.com/a/293145/401068 but so far there seems to be no resolution. I suspect it's a rather low-priority issue given the data explorer is a bit of a niche tool.