WORLDGUARD-4097 - Reported by x1p

WorldGuard Build #1903 introduces a bug in mines. Mining regions have the following flags:
{deny-message: '', block-break: allow, interact: allow}
This used to be working fine for sand like blocks.
Since WorldGuard Build #1903 shoveling Sand also needs the block-place: allow flag otherwise blocks can not be mined.
This is highly undesirable in mining situations.

Paper 1.13.2 build 629
WorldGuard 7.0.0 Release Candidate 2
WorldEdit 7.0.0 Release Candidate 3