Note: My computer says my version is 1.14.003.2 but this is not available in the version drop-down.

Chunk is loaded (shows block outline) but invisible. I can approach the boundary and walk out onto the invisible blocks. This seems to occur most commonly in the nether, and it's only been in the last couple of days.

I made the mistake of walking into the invisible chunk in the nether, thinking it would load as I went along, and I lost a full set of enchanted equipment when I fell into a hole I could not see and died in lava.