QB Issue Resolution:

If you report on a previous year you will find the expenses are there

at the start of a new year, QB sets income and expense to zero by posting to retained earnings, or equity if you are sole trader.  That allows you to accumulate income and expenses per year as you need to

Resolution for Issue 'All expenses were removed with the new year. what happened ? Can i retrieve them ?' available: Yes (Solved).
Source: Intuit Community forum.

All expenses were removed with the new year. what happened ? Can i retrieve them ?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for accumulate income
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Error Recovery for accumulate income [Canada]
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