When I'm using the tunnel command, it sometimes (more than once) fell into lava because it was mining standing on suspened gravel and it updated. I know this is probably tricky as hell to prevent, but is there any workaround? avoidUpdatingFallingBlocks is set to true, but that didn't help either.
Hope this is not a duplicate, and appreciate any answers :)

Final checklist

• I know how to properly use check boxes
• I have not used any OwO's or UwU's in this issue.

Why did the gravel start falling and what command were you using?
avoidUpdatingFallingBlocks mostly affects pathfinding and I'm not sure whether it affects placing blocks at all.