Limitations on Content Matching in Excel

Good day Mr Noodlesoft,
Is there a limitation to Hazel's capability in performing content matching (contain match) on Excel files? It works just fine with Word documents. "Contents contain" matches perfectly. Only content contain match doesn't work. Clicking on the X icon yielded empty content field. Doing the same test on Word document works as expected.
macOS Mojave
Version 110.14 (18A391)
Excel version 16.29
Is there a limitation to Hazel's capability in performing content matching (contain match) on Excel files? It works just fine with Word documents. "Contents contain" matches perfectly. Only content contain match doesn't work. Clicking on the X icon yielded empty content field. Doing the same test on Word document works as expected.
macOS Mojave
Version 110.14 (18A391)
Excel version 16.29