Well, speaking as someone who actually enjoys drawing backgrounds, I'll still sometimes do panels where the background isn't present partly to save time but also partly for staging/composition purposes. And there have been times I've straight up changed the angle of a panel purely because something was giving me trouble to draw and it seemed better to just change the drawing entirely rather than wrestle with something that's just not cooperating. (Usually I end up liking the composition I came up with for the new panel a thousand times better)
Any major details that are suddenly missing from my own BGs are purely mistake (happened on a couple recent pages of one of my comics and I haven't gone back and fixed it yet cuz I've been really busy juggling other stuff)
HOWEVER, as much as I like drawing backgrounds, it mostly extends to new ones. If I've drawn the same BG too many panels in a row, I get really bored of it, because it's hard to add fun new details to something that's in your face. I try to do what I can, but sometimes it can't be helped.