|Is there a cell in the sheets that you link to that contains a date or something else that lets you know if the sheet has been updated? |
If so, use that as a key to determine if the links should return the data from the other sheet or return nothing.
Generically your links might look like this...
=IF(WB2!A1 = "a specific date or key character", WB2!A3, "")
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