I was initially stumped by the numbers; in my region, a decimal place is denoted by period ( . ), but you use a comma ( , ), so that didn’t work at all until I changed it. But that aside.
Now, the issue lies in how and what triggers recalculation.
I suspect for the most part, changing a cell’s value will trigger a recalculation of the whole workbook. The value of each calculated cell is stored with the formula, and this is saved in the file when closed.
The sample you provided is loaded with static data, and as values are stored with formulas, no recalculation is performed upon opening.
I confirmed this by editing the spreadsheet with a text editor and changing the value of one of the cells, and then opened the workbook normally to see that value of the cell I had changed was in effect, but the sheet with the reference to the other sheet still held the original value until I forced a recalculation.
What is different to your case from my test is my cells generating a random number. And because the cell values are dynamic, there is a special parameter attached to the formula cell which seems to force recalculation upon opening because they are referenced.
I tried this on your sample, and it worked.
This is however, not something that you could implement in your case in a practical sense.
I did try to add a single cell into one of the sheets which had an auto-recalculation attribute, but this only effected that cell alone, and as it was not referenced by other cells in the sheet, it had no knock-on effect.
The Only Office support team may have an option for you, but my impression is that you will need to manually refresh if any of the “static” data changes while the workbook is closed.
It gets really technical from here on…
If you really want the “nuts & bolts” about what I did; well, the sheet stores all the sheet as an XML file, and your cell content as
<c r="B2" s="2"><f ca="1">IFERROR(VALUE(MID(Billing!B2,FIND("-",Billing!B2)+1,99)),0)</f><v>5.5499999999999998</v></c>
• The c tag is a cell
• The r attribute is the cell co-ordinate, column B row 2
• The f tag holds the formula for the cell. I added the ca attribute to force recalculation
• The v tag holds the last known result of the formula
If you are not familiar on how to see this side of a spreadsheet, then it is probably better not to tamper, for at this level, a mistake could make a real mess.