I believe I found this bug on 1.14.4 - in survival mode, a creeper naturally spawned in a little spot I had hollowed out of a mountain for my mule. I thought it was pretty funny, so I went and made a name tag for it, entered creative mode, gave him a nice little home and named him Henry. I then walked off not too far away (unsure, no more than 200 blocks though) and came back to see he wasn't there anymore. No explosion damage anywhere despite being surrounded by cobblestone and dirt and the entrance sealed with panes so he wouldn't aggro.
Sorry if that's too much info, but I'm not certain if I'm on the right bug page. It just sounds like a similar issue.
Tom Harris
I believe I found this bug on 1.14.4 - in survival mode, a creeper naturally spawned in a little spot I had hollowed out of a mountain for my mule. I thought it was pretty funny, so I went and made a name tag for it, entered creative mode, gave him a nice little home and named him Henry. I then walked off not too far away (unsure, no more than 200 blocks though) and came back to see he wasn't there anymore. No explosion damage anywhere despite being surrounded by cobblestone and dirt and the entrance sealed with panes so he wouldn't aggro.
Sorry if that's too much info, but I'm not certain if I'm on the right bug page. It just sounds like a similar issue.