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The prior zone volume calculation could result in incorrect volumes for zones with gaps. That's why it now checks for gaps. See the following fixes made in v8.8 #6056 and #6299.

With the posted file it appears that the entered zone volume is being used. Output from v8.9.0

   ** Warning ** CalculateZoneVolume: 5 zones are not fully enclosed. For more details use:  Output:Diagnostics,DisplayExtrawarnings;

And from the eio ouput:

! <Zone Information>,Zone Name,North Axis {deg},Origin X-Coordinate {m},Origin Y-Coordinate {m},Origin Z-Coordinate {m} . . . ,Volume {m3},Zone Inside Convection Algorithm . . .
Zone Information, PLANTABAJA,0.0,0.45,9.66,0.00 . . .,227.08,TARP . . .

And if you add Output:Table:SummaryReports, AllSummary;, the Input Verification and Results Summary, ZoneSummary shows the entered volumes.

Area [m2]   Conditioned (Y/N)   Part of Total Floor Area (Y/N)  Volume [m3]
PLANTABAJA  79.04   Yes Yes 227.08
SALAESTAR   41.2    Yes Yes 71.15