After being encouraged by Cirevam, I've decided to make a topic for reporting weird map editing issues.
To kick things off here's one issue that I get consistently:
So in sharkly's map The Nightmare Begins, I had an issue with adding objects into a cave because they'd show up as rubble instead. When taking screenshots for this topic, the objects showed up fine this time around but something else jumped out at me (which may have been what was actually happening).
So the object I added is to the left of the circled squares. The squares I highlighted end up as walls that collapse once that hard rock wall is blasted away.
That shouldn't be happening.
Here's another example from Driller Night:
If you drill a different wall, the lava monster I circled in the map creator screenshot is replaced by rubble.
Before someone asks, no, the landslide indicator was for somewhere else.
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The other issue I noticed was an absolutely bizarre map glitch in Baz's rendition of Frozen Frenzy. Specifically one wall suffers from the infamous "pothole" and attempting to fix it doesn't seem to affect it. But what I did see was that the surf map seemed to generate dirt walls from absolutely nowhere when I tried removing solid rock walls (hoping this would help fix the issue). I'll update this topic with screenshots of the pothole and what happened when editing the surf map.