Fix thread-safe issue ScanProperties

[304NotModified]

Fixes #1262

[codecov-io]

Current coverage is 74.61%

Merging #1294 into master will decrease coverage by -0.04% as of d5f26cb

@@            master   #1294   diff @@
======================================
  Files          267     267       
  Stmts        15427   15445    +18
  Branches      1619    1620     +1
  Methods          0       0       
======================================
+ Hit          11517   11524     +7
- Partial        379     380     +1
- Missed        3531    3541    +10

Review entire Coverage Diff as of d5f26cb

---

Uncovered Suggestions

1. +0.09% via ...gingConfiguration.cs#282...295
2. +0.09% via ...gingConfiguration.cs#248...261
3. +0.08% via ...argets/FileTarget.cs#1713...1725
4. See 7 more...

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